What should come in place of the question mark (?) in the given series based on the English alphabetical order? CIF IOL OUR UAX ?
AGD
Compare the first letters of each term: C(3), I(9), O(15), U(21) — each increases by 6.
So the next first letter is U(21) + 6 = 27, which wraps to A(1).
Compare the second letters: I(9), O(15), U(21), A(27→1) — each also increases by 6, so the next is A(1) + 6 = 7 = G.
Compare the third letters: F(6), L(12), R(18), X(24) — each increases by 6, so the next is X(24) + 6 = 30, which wraps to D(4).
Hence, the missing term is AGD.
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