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    Which of the following letter-number cluster will replace the question mark (?) in the given series? UDF6, VFI9, ?, XJO15, YLR18, ZNU21
    Question

    Which of the following letter-number cluster will replace the question mark (?) in the given series?
    UDF6, VFI9, ?, XJO15, YLR18, ZNU21

    A.

    WHL12

    B.

    XHL12

    C.

    WIK11

    D.

    VGK11

    Correct option is A

    Let's break down the pattern in the given series:
    First Letter Pattern:
    U, V, ?, X, Y, Z
    Here, the first letters are increasing by 1 position in the alphabet:
    U → V → W → X → Y → Z
    So, the missing first letter is W.
    Second Letter Pattern:
    D, F, ?, J, L, N
    Here, the second letters are increasing by 2 positions in the alphabet:
    D → F → H → J → L → N
    So, the missing second letter is H.
    Third Letter Pattern:
    F, I, ?, O, R, U
    Here, the third letters are increasing by 3 positions in the alphabet:
    F → I → L → O → R → U
    So, the missing third letter is K.
    Number Pattern:
    6, 9, ?, 15, 18, 21
    Here, the numbers are increasing by 3:
    6 → 9 → 12 → 15 → 18 → 21
    So, the missing number is 12.
    Thus, the missing cluster is WHL12.
    Therefore, the correct answer is (A) WHL12.

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