Choose The Correct Number :

In each of the following question (1-10) a number series is given with one term missing, Choose the correct alternative that will continue the same pattern and replace the question mark in the given series:

  1. 20, 19, 17, 7, 10, 5
    (a) 15                       (b) 14                               (c) 11                                           (d) 13
  2. 6, 11, 21, 36, 56, ?
    (a) 91                          (b) 71                           (c) 61                                             (d) 81
  3. 53, 53, 40, 40, 27, 27, ?
    (a) 12                           (b) 15                           (c) 14                                            (d) 16
  4. 10, 14, 26, 42, 70, ?
    (a) 124                         (b) 114                     (c) 132                                           (d) 116
  5. 5, 9, 17, 29, 45, ?
    (a) 55                       (b) 65                             (c) 80                                           (d) 60
  6. 2, 6, ,12, 20, 30, 42, 56, ?
    (a) 63                          (b) 67                        (c) 72                                              (d) 80
  7. 1000, 200, 40, ?
    (a) 15                            (b) 10                      (c) 20                                            (d) 8
  8. F2, ? D8, C16, B32,
    (a) E4                     (b) G5                          (c) D4                                               (d) E6
  9. 1, 6, 13, 22, 33, ?
    (a) 48                       (b) 49                         (c) 42                                         (d) 46
  10. 13, 35, 57, 79, 911, ?
    (a) 1055                  (b) 1005                 (c) 1140                                 (d) 1113
Anurag Mishra Professor Asked on 24th September 2015 in Reasoning Questions.
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1 Answer(s)
  1. Answer: (b) 14

     

    Explanation:-
    20 – 1  = 19, 19 – 2 = 17. 17 – 3 = 14, 14 – 4 = 10, 10 – 5 = 5.
    Hence, the value of ? is 14.

  2. Answer:  (d) 81

     

    Explanation:-
    6 + (1 x 5 ) = 6 + 5 = 11,
    11 + (2 x 5) = 11 + 10 = 21,
    21 + (3 x 5) = 21 + 15 = 36,
    36 + (4 x 5) = 36 + 20 = 56,
    56 + (5 x 5) = 56 + 25 = 81.
    Hence, the answer is (d) 81.

  3. Answer:  (c) 14

     

    Explanation:-
    53 – 13 = 40,
    40 – 13 = 27,
    Similarly, 27 – 13 = 14.
    Hence, the answer is (c)  14.

  4. Answer: (b) 114

     

    Explanation:-

     

  5. Answer: (b) 65
    Explanation:-
    5 + (1 x 4) = 5 + 4 = 9,
    9 + (2 x 4) = 9 + 8 = 17,
    17 + (3 x 4) = 17 + 12 = 29,
    29 + (4 x 4) = 19 + 16 = 45,
    Same as,  45 + (5 x 4) = 45 + 20 = 65.
    Hence, the answer is (b) 65.
  6. Answer: (c) 72

     

    Explanation:-
    2 + (2 x 2 ) = 2 + 4 = 6,
    6 +  (2 x 3) = 6 + 6 = 12,
    12 + (2 x 4 ) = 12 + 8 = 20,
    20 + (2 x 5 ) = 20 + 10 = 30,
    30 + (2 x 6) = 30 + 12 = 42,
    42 + (2 x 7) = 42 + 14 = 56,
    56 + (2 x 8)  = 56 + 16 = 72.
    Hence, the answer is (c) 72.

  7. Answer: (d) 8

     

    Explanation:-
    1000/5 = 200,
    200/5 = 40,
    Same as, 40/5 = 8
    Hence, the answer is (d) 8.

  8. Answer: (a) E4

     

    Explanation:-
    F – 1 = E  & 2 x 2 = 4,
    E – 1 = D & 4 x 2 = 8,
    D – 1 = C & 8 x 2 = 16,
    C – 1 = B & 16 x 2  =32.
    Hence, the answer is (a) E4.

  9. Answer: (d) 46

     

    Explanation:-
    1 + 5 = 6,
    6 + (5 + 2) = 6 + 7 = 13,
    13 + (7 + 2) = 13 + 9 = 22,
    22 + (9 + 2) = 22 + 11 = 33,
    Same as, 33 + (11 + 2) = 33 + 13 = 46,
    Hence, the answer is (d) 46.

  10. Answer: (d) 1113
     Explanation:-
    13 + 22 = 35,
    35 + 22 = 57,
    57 + 22 = 79,
    79 + 22 = 7 + 2 = 9 & 9 + 2 = 11 = 911,
    Same as, 911 + 22 = 9 + 2 = 11 &  11 + 2 = 13 = 1113.
    Hence, the answer is (d) 1113.
Anurag Mishra Professor Answered on 26th September 2015.
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