Series Test

Result

Series Test - 3

Score
-
out of -
Rank
-
out of -

TIME Taken - -

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following terms of the A.P. must be zero if the sum of 3^rd and 7^th term of the A.P. is equal to 4^th term of the A.P.?

A
9^th

B
8^th

C
7^th

D
6^th

Solution

T₃ + T₇ = T₄

a + 2d + a + 6d = a + 3d
2a + 8d = a + 3d
a + 5d = 0

T₆ = 0
Question 2
1 / -0

Find four numbers in a GP whose sum is 85 and product is 4096.

A
1, 4, 16, 64

B
2, 3, 18, 62

C
1, 6, 15, 65

D
None of these

Solution

Only in option (1), numbers are in a GP whose sum is 85 and product is 4096.