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Discussion :: Number,Ranking&Time Sequence Test

  1. Study the following information and answer the questions given below:
    25 boy-scouts bearing names from A to Y were standing in a row. The teacher wanted to select various teams from among them. He gave them random number from 3 to 8 a shown below:
    A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
    4 4 6 3 5 4 3 3 5 6 7 5 8 3 8 7 7 8 4 8 7 4 5 6 6 

    If he decides to pick up those exclusive pairs of adjacent boys whose numbers if totaled turn out to be exactly 12, how many such pairs would be available?
    2. A.
    Nil
    B.
    Six
    C.
    Five
    D.
    Four
    E.
    None of these

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    Answer : Option E

    Explanation :

    KL, RS, St, XY.... We have four such pairs of adjacent boys. But note the phrase "exclusive pairs". Since S is common in RS and ST we can have only one of the two pairs. Hence, three pairs.

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