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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? HLG, KOJ, NRM, QUP,?
TXS
XST
XTS
TSX
TXS
Look at the first letter of each triplet: H(8), K(11), N(14), Q(17). They increase by 3. The next start must be 17+3 = 20 (T).
Look at the first letter of each triplet: H(8), K(11), N(14), Q(17). They increase by 3. The next start must be 17+3 = 20 (T).
Analyze the first letter
H(8) + 3 = K(11), K(11) + 3 = N(14), N(14) + 3 = Q(17), Q(17) + 3 = T(20). The first letter of the next term is T.
Analyze the second letter
L(12) + 3 = O(15), O(15) + 3 = R(18), R(18) + 3 = U(21), U(21) + 3 = X(24). The second letter of the next term is X.
Analyze the third letter
G(7) + 3 = J(10), J(10) + 3 = M(13), M(13) + 3 = P(16), P(16) + 3 = S(19). The third letter of the next term is S.
Combine results
Combining the calculated letters T, X, and S, we get the resulting term TXS.
B: Starts with X, incorrect. C: Starts with X, incorrect. D: Starts with T but second and third letters (SX) are out of sequence.
A is correct because each letter in the triplet increases by a constant value of 3 from the corresponding letter in the previous triplet (H+3=K, L+3=O, G+3=J, etc.), leading to TXS.
For letter series, always check the individual progression of the first, second, and third letters separately. Most SSC questions use simple addition or subtraction offsets.
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