Choose the correct alternative from the given ones that will complete the series:

Directions: In the following Four questions, a series is given with one (or more) term missing. Choose the correct alternative from the given ones that will complete the series:

  1. C4X, F9U, I16R, ?
    (a) L25P
    (b) L25U
    (c) L27P
    (d) K25P
  2. 15, 21, 57, ____, 221
    (a) 96
    (b) 108
    (c) 121
    (d) 126
  3. 720, 180, 176, 44, 40, 10, ___
    (a) 6, 2
    (b) 4, 2
    (c) 6, 4
    (d) 8, 6
  4. 5, 10, 20, 40, 80, ___
    (a) 120
    (b) 140
    (c) 150
    (d) 160
Anurag Mishra Professor Asked on 8th February 2016 in Reasoning Questions.
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  • 2 Answer(s)
    1.  L25O                  (All options are wrong)

      Explanation:-
      C (3) + 3 = F (6),  4 + 5 = 9  &  X – 3 = U, 
      F (6)  + 3 = I ((9),  9 + 7 = 16  &  U – 3 = R, 

      Same as, 
      I (9)  + 3 = L (12),   16 + 9 = 25  & R – 3 = O. 

      Then, the next  term will be L25O. 

      Hence, the correct answer is L25O. 

    2. (c) 121 

      Explanation:-

    3. (a) 6, 2

      Explanation:-
      720 / 4 = 180,   180 – 4 = 176,  176/4 = 44,  44 – 4 = 40,  40/4 = 10, 
      Same as, 
      10 – 4 = 6 & 6/4 = 1.5 
       = 2 (Approx)
      Then, the next number is 6, 2.

      Hence, the correct answer is option (a) 6, 2. 

    4.  (d) 160 

      Explanation:-
      5 x 2 = 10,  10 x 2 = 20,  20 x 2 = 40,  40 x 2 = 80, 

      Same as, 
      80 x 2 = 160.

      Then, the next number will be 160. 

      Hence, the correct answer is option (d) 160. 

     

    Anurag Mishra Professor Answered on 8th February 2016.
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    Excuse me!! where is the explanation of question no.2 ???

    Anirban Default Answered on 3rd April 2016.
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