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    Question

    Select the letter cluster from among the given options

    that can replace the question mark (?) in the following series. CHK, EFM, GDO, ?, KZS
    A IQB Correct Answer Incorrect Answer
    B IFQ Correct Answer Incorrect Answer
    C IQF Correct Answer Incorrect Answer
    D IBQ Correct Answer Incorrect Answer

    Solution

    C + 2 = E; E + 2 = G; G + 2 = I; I + 2 = K H – 2 = F; F – 2 = D; D – 2 = B; B – 2 = Z K + 2 = M; M + 2 = O; O + 2 = Q; Q + 2 = S

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