Letter Repeating Series


Letter Repeating Series - Concepts
Class - 7th Foundation NTSE Subjects
 
 
Concept Explanation
 

Letter Repeating Series

Letter Repeating Series:

This type of questions usually of a series of small letters which follow a certain pattern. However, some letters are missing from the series. These missing letter are then given in a proper sequence as one of the alternatives. The candidate is required to choose this alternative as the answer.

Example : aab ___aaa____bba____

(a) baa                (b) abb           (c) bab           (d) aab          (e) bbb

Solution: We proceed step by step as shown below :

  • The first blank space should be filled in by b so that we have two a's followed by two b's
  • The second blank space should be filled in either by a so that we have four a's followed by two b's, or b so that we have three a's followed by three b's
  • The last space must be filled in by a.
  • Thus, we have two possible answers, baa and bba. But only baa appears in the alternatives. So, the answer is (a).
  • In case, we had both the possible answers in the alternatives, we would have chosen the one that forms a more prominent pattern, which is aabb/aaabbb/aa. Thus, our answer would have been bba.
  • Ex. In the following series, choose the alternative which contains the numerals to be filled in the marked spaces, in the coorect order:

                  B __ __ D __ __ C A B D A C B

                  __ __ 4 1 3 2 __ __ __ ? ? ? ?

                 a __ a __ b c __ c __ __ __ __ __

        (a) 1, 2, 3, 4              (b) 2, 3,1, 4             (c) 1, 2, 4, 3           (d) 2, 1, 4, 3

    Sol.  Clearly, in the second series, 1 occurs at the same position as D occurs in the first series.So, 1 corresponds to D. Thus, the first question mark below D is to replaced by 1. Now, in the third series, c at the eighth place corresponds to A in the first series, while c at the sixth place corresponds to 2 in the second series. So, 2 corresponds to A. Thus, the second question mark below A is to be replaced by 2.

    In the third series, a at the first place correspnds to B in the first series and a at the third place corresponds to 4 in the second series. So, 4 corresponds to B. Thus, the question mark below B is to be replaced by 4.

    Now, only 3 remains. So, 3 corresponds to C. Thus, the question mark below C is to be replaced by 3. Thus, DA'CB corresponds to 1, 2, 3, 4.

    Hence, the answer is (a).

    1.  ccbb __ aa __ cc __ bbbaa __ c

      (a) acbc              (b) babca           (c) baba              (d) acba

    Answer: (b) : The series is ccc bbb aaa/ccc bbb aaa/c. Thus, the pattern ccc bbb aaa is repeated.

    2. C B __ __ D __ B A B C C B

        __ __ 1 2 4 3 __ __ ? ? ? ?

      a __ a b __ c __ b __ __ __ __

    (a)  3, 4, 4, 3               (b) 3, 2, 2, 3           (c) 3, 1, 1, 3             (d) 1, 4, 4, 1

    Answer: (c) :Comparing the positions of the capital letters, numbers and small letters, we find: a corresponds to C and 1 corresponds to a, So, a and 1 correspond to C.b corresponds to A and 2 corresponds to b. So, b and 2 correspond to A. Also, 4 corresponds to D.

    So, the remaining number i.e. 3 corresponds to B. So, BCCB corresponds to 3, 1, 1, 3.

    Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

    Complete the series

    _ yz _ zx _ xyx _ z _ zxzxy

    Right Option : A
    View Explanation
    Explanation
    Question : 2

    Complete the series :

    _ op _ mo _ n _ _ pnmop _.

    Right Option : A
    View Explanation
    Explanation
    Question : 3

    Complete the series:

    ab_ _ baa_ _ ab_

    Right Option : B
    View Explanation
    Explanation
     
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