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    Which number will best complete the relationship given below? 21 : 36 :: 13 : ?
    Question

    Which number will best complete the relationship given below?
    21 : 36 :: 13 : ?

    A.

    22

    B.

    23

    C.

    24

    D.

    20

    Correct option is D

    Let's examine the relationship between the numbers:
    For the first pair 21:36
    21×2=42
    Subtract 6: 42−6=36
    Apply the same logic to the second pair 13:?
    13×2=26
    Subtract 2: 26−2=24
    Thus, the correct answer is (c) 24.

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