Number Series Test

Result

Number Series Test - 7

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Weekly Quiz Competition

Question 1
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
6, 15, 35, 77, 165, 221

A
35

B
77

C
165

D
15

Solution

The terms of the series are products of two consecutive prime numbers i.e. (2 x 3),
(3 x 5), (5 x 7), (7 x 11),.....
So, 165 is wrong and must be replaced by (11 x 13) i.e. 143.
Question 2
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
121, 143, 165, 186, 209

A
143

B
165

C
186

D
209

Solution

Each term in the series is obtained by adding 22 to the preceding term.
So, 186 is wrong and must be replaced by (165 + 22) i.e. 187.
Question 3
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
8, 13, 21, 32, 47, 63, 83

A
13

B
21

C
32

D
47

Solution

The correct pattern is + 5, + 8, + 11, + 14,.....
So, 47 is wrong and must be replaced by (32 + 14) i.e. 46.
Question 4
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
3, 4, 10, 32, 136, 685, 4116

A
10

B
32

C
136

D
4116

Solution

The correct pattern is x 1 + 1, x 2 + 2, x 3 + 3, x 4 + 4,.....
So, 32 is wrong and must be replaced by (10 x 3 + 3) i.e. 33.
Question 5
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
1, 2, 4, 8, 16, 32, 64, 96

A
4

B
32

C
64

D
96

Solution

Each term of the series is obtained by multiplying the preceding term by 2.
So, 96 is wrong and must be replaced by (64 x 2) i.e. 128.
Question 6
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
105, 85, 60, 30, 0, - 45, - 90

A
105

B
60

C
0

D
-45

Solution

The correct pattern is - 20, - 25, - 30,.....
So, 0 is wrong and must be replaced by (30 - 35) i.e. - 5.
Question 7
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
2, 5, 10, 17, 26, 37, 50, 64

A
17

B
26

C
37

D
64

Solution

The terms of the series are (1² + 1), (2² + 1), (3² + 1), (4² + 1), (5² + 1), (6² + 1),
(7²+1),.....
So, 64 is wrong and must be replaced by (8² + 1) i.e. 65.
Question 8
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
125, 126, 124, 127, 123, 129

A
126

B
124

C
123

D
129

Solution

The correct pattern is + 1, - 2, + 3, - 4, + 5.
So, 129 is wrong and must be replaced by (123 + 5) i.e. 128.
Question 9
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
1,3,12,25,48

A
3

B
12

C
25

D
48

Solution

The terms of the series are (l² - 0²), (2² - l²), (4² - 2²), (6² - 3²) and (8² - 4²).
So, 25 is wrong and must be replaced by (6² - 3²) i.e. 27.
Question 10
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
2, 5, 10, 50, 500, 5000

A
5

B
10

C
50

D
5000

Solution

Each term of the series is the product of the preceding two terms.
So, 5000 is wrong and must be replaced by (50 x 500) i.e. 25000.
Question 11
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
15, 16, 22, 29, 45, 70

A
16

B
22

C
45

D
70

Solution

The correct pattern is + 1, + 4, + 9, + 16, + 25 i.e. + 1², + 2², + 3², + 4², + 5².
So, 22 is wrong and must be replaced by (16 + 4) i.e. 20.
Question 12
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
8, 14, 26, 48, 98, 194, 386

A
14

B
48

C
98

D
194

Solution

The correct pattern is x 2 - 2.
So, 48 is wrong and must be replaced by (26 x 2 - 2) i.e. 50.
Question 13
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
3, 10, 27, 4, 16, 64, 5, 25, 125

A
3

B
4

C
10

D
27

Solution

The correct sequence is 3, 3², 3³, 4, 4², 4³, 5, 5², 5³.
So, 10 is wrong and must be replaced by 3² i.e. 9.
Question 14
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
4, 10, 22, 46, 96, 190, 382

A
4

B
10

C
96

D
382

Solution

The correct pattern is + 6, + 12, + 24, + 48, + 96, + 192.
So, 96 is wrong and must be replaced by (46 + 48) i.e. 94.
Question 15
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
1, 5, 9, 15, 25, 37, 49

A
9

B
15

C
25

D
37

Solution

The terms of the given series are 1², (2² + 1), 3², (4²..+ 1), 5², (6² + 1), 7².
So, 15 is wrong and must be replaced by (4² + 1) i.e. 17.
Question 16
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
2, 6, 24, 96, 285, 568, 567

A
6

B
24

C
285

D
567

Solution

The correct pattern is x 6 - 6, x 5 - 5, x 4 - 4,.....
So, 24 is wrong and must be replaced by (6 x 5 - 5) i.e. 25.
Question 17
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
3, 2, 8, 9, 13, 22, 18, 32, 23, 42

A
8

B
9

C
13

D
22

Solution

The given sequence is a combination of two series:
I. 3, 8, 13, 18, 23 and II. 2, 9, 22, 32, 42
The pattern in I is + 5, and the pattern in II is + 10. So, in II, 9 is wrong and must be replaced by (2 + 10) i.e. 12.
Question 18
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
196, 169, 144, 121, 101

A
101

B
121

C
169

D
196

Solution

The sequence is (14)², (13)², (12)², (11)², (10)².
So, 101 is wrong and must be replaced by (10)² i.e. 100.
Question 19
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
56, 58, 62, 70, 84, 118, 182

A
58

B
62

C
84

D
118

Solution

The correct pattern is + 2, + 4, + 8, + 16, + 32, + 64 i.e. + 2, + 2², + 2³, + 2⁴, + 2⁵, + 2⁶.
So, 84 is wrong and must be replaced by (70 + 16) i.e. 86.
Question 20
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
1, 5, 5, 9, 7, 11, 11, 15, 12, 17

A
11

B
12

C
17

D
15

Solution

The given sequence is a combination of two series:
I. 1, 5, 7, 11, 12 and II. 5, 9, 11, 15, 17
The pattern in both I and II is + 4, + 2, + 4, + 2. So, 12 is wrong and must be replaced by (11 + 2) i.e. 13.
Question 21
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
25, 36, 49, 81, 121, 169, 225

A
36

B
49

C
169

D
225

Solution

The correct sequence is 5², 7², 9², 11², 13², 15². So, 36 is wrong.
Question 22
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
1, 3, 10, 21, 64, 129, 356, 777

A
21

B
129

C
10

D
356

Solution

The correct pattern is x 2 + 1, x 3 + 1, x 2 + 1, x 3 + 1,.....
So, 356 is wrong and must be replaced by (129 x 3 + 1) i.e. 388.
Question 23
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
5, 10, 40, 80, 320, 550, 2560

A
80

B
320

C
550

D
2560

Solution

The correct pattern is x 2, x 4, x 2, x 4, .....
So, 550 is wrong and must be replaced by (320 x 2) i.e. 640.
Question 24
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
2, 3, 4, 4, 6, 8, 9, 12, 16

A
3

B
6

C
9

D
12

Solution

The given sequence is a combination of three series:
I. 1st, 4th, 7th terms i.e. 2, 4, 9,.....
II. 2nd, 5th, 8th terms i.e. 3, 6, 12,.....
III. 3rd, 6th, 9th terms i.e. 4, 8, 16,.....
In each one of I, II and III, each term is twice the preceding term. So, 9 is wrong and must be replaced by (4 x 2) i.e. 8.
Question 25
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
11, 5, 20, 12, 40, 26, 74, 54

A
5

B
20

C
40

D
26

Solution

The given sequence is a combination of two series :
I. 11, 20, 40, 74 and II. 5, 12, 26, 54
The correct pattern in I is + 9, + 18, + 36,.....
So, 40 is wrong and must be replaced by (20 + 18) i.e. 38.
Question 26
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
5, 27, 61, 122, 213, 340, 509

A
27

B
61

C
122

D
509

Solution

The terms of the series are (2³ - 3), (3³ - 3), (4³ - 3), (5³ - 3), (6³ - 3), (7³ - 3),
(8³-3).
So, 27 is wrong and must be replaced (3³ - 3) i.e. 24.
Question 27
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
3, 7, 15, 39, 63, 127, 255, 511

A
15

B
39

C
63

D
127

Solution

The correct pattern is x 2 + 1.
So, 39 is wrong and must be replaced by (15 x 2 + 1) i.e. 31.
Question 28
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
380, 188, 92, 48, 20, 8, 2

A
8

B
20

C
48

D
188

Solution

The correct pattern is - 192, - 96, - 48, - 24, - 12, - 6.
So, 48 is wrong and must be replaced by (92 - 48) i.e. 44.
Question 29
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
16, 22, 30, 45, 52, 66

A
30

B
45

C
52

D
66

Solution

The correct pattern is + 6, + 8, + 10, + 12, + 14.
So, 45 is wrong and must be replaced by (30 + 10) i.e. 40.
Question 30
3 / -1

Directions to Solve
In this type of questions, one term in the number series is wrong. Find out the wrong term.
Question -
10, 26, 74, 218, 654, 1946, 5834

A
26

B
74

C
218

D
654

Solution

The correct pattern is x 3 - 4.
So, 654 is wrong and must be replaced by (218 x 3 - 4) i.e. 650.

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Re-Attempt Weekly Quiz Competition

Number Series Test - 7

Result

Number Series Test - 7

Score

-

Rank

-

SHARING IS CARING

Question 1

35

77

165

15

Solution

Question 2

143

165

186

209

Solution

Question 3

13

21

32

47

Solution

Question 4

10

32

136

4116

Solution

Question 5

4

32

64

96

Solution

Question 6

105

60

0

-45

Solution

Question 7

17

26

37

64

Solution

Question 8

126

124

123

129

Solution

Question 9

3

12

25

48

Solution

Question 10

5

10

50

5000

Solution

Question 11

16

22

45

70

Solution

Question 12

14

48

98

194

Solution