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    Question

    Select the letter-cluster from among the given option

    that can replace the question mark (?) in the following series. K, S, Z, F, K, O, ?
    A R Correct Answer Incorrect Answer
    B Q Correct Answer Incorrect Answer
    C O Correct Answer Incorrect Answer
    D P Correct Answer Incorrect Answer

    Solution

    K + 8 = S S + 7 = Z Z + 6 = F F + 5 = K K + 4 = O O + 3 = R

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