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    Question

    What should come in place of the question mark (?) in

    the given series based on the English alphabetical order? NRT, JNP, FJL, BFH, ?
    A XZS Correct Answer Incorrect Answer
    B XDF Correct Answer Incorrect Answer
    C XAD Correct Answer Incorrect Answer
    D XBD Correct Answer Incorrect Answer

    Solution

    Look at the positions (A=1, B=2, …):

    N(14) R(18) T(20)
    J(10) N(14) P(16) β†’ each letter βˆ’4
    F(6) J(10) L(12) β†’ each letter βˆ’4
    B(2) F(6) H(8) β†’ each letter βˆ’4

    Continue βˆ’4 from B(2), F(6), H(8):

    B(2) βˆ’ 4 = βˆ’2 β†’ +26 = 24 β†’ X
    F(6) βˆ’ 4 = 2 β†’ B
    H(8) βˆ’ 4 = 4 β†’ D

    So the next term is XBD .

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