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    Question

    Which letter cluster will replace the question mark [?]

    in the following series? HYR, LCQ, PGP, TKO, XON, ? 
    A BSM Correct Answer Incorrect Answer
    B UVW Correct Answer Incorrect Answer
    C KEX Correct Answer Incorrect Answer
    D BFS Correct Answer Incorrect Answer

    Solution

    The first letter and the second letter in each letter cluster are replaced by the fourth succeeding letter, as per English alphabetical order. The third letter in each letter cluster is replaced by immediate preceding letter, as per English alphabetical order. So, H + 4 = L, L + 4 = P, P + 4 = T, T + 4 = X, X + 4 = B Y + 4 = C, C + 4 = G, G + 4 = K, K + 4 = O, O + 4 = S R - 1 = Q, Q - 1 = P, P - 1 = O, O - 1 = N, N - 1 = M So, 'BSM' will replace the question mark in the given series. 

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