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Permutations and Combinations Test 5

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Permutations and Combinations Test 5
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  • Question 1
    1 / -0
    - acca - ccca - acccc - aaa
    Solution
    The series is c a /  c c a a / c c c a  a a / c c c c a a a a
  • Question 2
    1 / -0
    abca - bcaab - ca - bbc - 
    Solution
    The series is abc/aabc/aabbc/ aabbcc
  • Question 3
    1 / -0
    aab - aa - bbb - aaa- bbb
    Solution
    The series is a bb/ aaabbb/aaaabbbb Thus the letters are reparted twice thrice and four times etc
  • Question 4
    1 / -0
    Find the missing letters
    DF, GJ, KM, NQ, RT, .....
    Solution
    Pattern is
     4D6F,7G10J,11K13M,14N17Q,18R20T,21U24X\displaystyle  ^{4}D^{6}F,^{7}G^{10}J,^{11}K^{13}M,^{14}N^{17}Q,^{18}R^{20}T,^{21}U^{24}X,......
    \displaystyle \therefore Missing letter = UX
  • Question 5
    1 / -0
    - - G - C - GK - PG -
    Solution
    The series is - - G -
                         C - G K
                         - P G - 
    Clearly the group of four letters is CPGK
  • Question 6
    1 / -0
    Find the missing letters
    A, D, H, M, S .....
    Solution
    Pattern is
     1A,1A+3,4D+4,8H+5,13M+6,19S+7,26Z\displaystyle  ^{1}A,^{1}A+3,^{4}D+4,^{8}H+5,^{13}M+6,^{19}S+7,^{26}Z.....
    \displaystyle \therefore Missing letter = Z
  • Question 7
    1 / -0
    Find the missing letters
    R, M, ....., F, D, C
    Solution
    Pattern is
     18R,18R5,13M4,9I3,6F2,4D1,3C.....\displaystyle  ^{18}R,^{18}R-5,^{13}M-4,^{9}I-3,^{6}F-2,^{4}D-1,^{3}C.....
     \displaystyle  \therefore Missing letter = I
  • Question 8
    1 / -0
    Find the missing letters
    AZ, BY, CX, DW, .......
    Solution
    Pattern is  1AZ1,2BY2,3CX3,4DW4,5EV5,\displaystyle  ^{1}AZ_{1},^{2}BY_{2},^{3}CX_{3},^{4}DW_{4},^{5}EV_{5},......
     \displaystyle  \therefore Missing letter = EV
  • Question 9
    1 / -0
    - AN - B - N - BA - G
    Solution
    The series is BANG / BANG / BANG
  • Question 10
    1 / -0
    Find the missing letters
    ABZ, BCY, CDX, DEW, .....
    Solution
    Pattern is
     1A2BZ1,2B3CY2,3C4DX3,4D5EW4,5E6FV5\displaystyle  ^{1}A^{2}BZ_{1},^{2}B^{3}CY_{2},^{3}C^{4}DX_{3},^{4}D^{5}EW_{4},^{5}E^{6}FV_{5},....
    \displaystyle \therefore Missing letter = EFV
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