Which one of the following series of letters follows a pattern and is

Which one of the following series of letters follows a pattern and is different from the rest ?

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A D H M S Z

B E J N Q X

D G K P U Y

C F I O S Z

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC CAPF – 2015

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The series in option A follows a distinct pattern based on the position of letters in the alphabet: A(+3) D(+4) H(+5) M(+6) S(+7) Z. The difference in position between consecutive letters increases by one each time (3, 4, 5, 6, 7). The other series do not follow such a consistent arithmetic progression of differences.

Letter series questions often involve patterns based on alphabetical position, skipping letters, or other sequences. Identifying the pattern involves calculating the difference in position between consecutive letters and looking for a rule.

Let’s examine the differences in alphabetical position for other options:
B) B(2) E(5) J(10) N(14) Q(17) X(24) -> +3, +5, +4, +3, +7
C) D(4) G(7) K(11) P(16) U(21) Y(25) -> +3, +4, +5, +5, +4
D) C(3) F(6) I(9) O(15) S(19) Z(26) -> +3, +3, +6, +4, +7
None of these exhibit the simple, consistently increasing difference pattern seen in option A. Therefore, option A is the one that follows a clear pattern, making it different from the rest.

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