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Which of the following options should come in place of the question mark (?) in the given series based on the English alphabetical order? RMK, UOL, XQM, ASN,?
DUO
DUP
EUO
DQO
DUO
Look at the pattern for each letter position separately: the first letters jump +3, second letters jump +2, third letters jump +1.
Look at the pattern for each letter position separately: the first letters jump +3, second letters jump +2, third letters jump +1.
Analyze 1st Letters
R(18), U(21), X(24), A(1). Adding 3 to each: 18+3=21(U), 21+3=24(X), 24+3=27=1(A), 1+3=4(D).
Analyze 2nd Letters
M(13), O(15), Q(17), S(19). Adding 2 to each: 13+2=15(O), 15+2=17(Q), 17+2=19(S), 19+2=21(U).
Analyze 3rd Letters
K(11), L(12), M(13), N(14). Adding 1 to each: 11+1=12(L), 12+1=13(M), 13+1=14(N), 14+1=15(O).
B: Incorrect, pattern results in DUO, not DUP. C: Incorrect, does not follow the +3, +2, +1 logic. D: Incorrect, letters do not match the sequential calculation.
A is correct because the series follows a consistent logic of increasing the first letter by 3, the second letter by 2, and the third letter by 1, resulting in DUO.
For letter series, always write the positional numbers (A=1, B=2...) to quickly spot common arithmetic differences between terms.
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