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What should come in place of the question mark (?) in the given series? AZY CXW EVU GTS?
IRQ
IRP
ISQ
ISP
IRQ
Observe the first, second, and third letters of each cluster independently, noting that the first letters follow +2, middle letters follow -2, and last letters follow -2 sequence.
Observe the first, second, and third letters of each cluster independently, noting that the first letters follow +2, middle letters follow -2, and last letters follow -2 sequence.
Analyze the first letters of each cluster
The first letters are A (1), C (3), E (5), G (7). The pattern is +2. Therefore, the next letter is G + 2 = 9 (I).
Analyze the second letters of each cluster
The second letters are Z (26), X (24), V (22), T (20). The pattern is -2. Therefore, the next letter is T - 2 = 18 (R).
Analyze the third letters of each cluster
The third letters are Y (25), W (23), U (21), S (19). The pattern is -2. Therefore, the next letter is S - 2 = 17 (Q).
B: IRP is incorrect because the third letter must be Q based on the -2 pattern. C: ISQ is incorrect because the second letter must be R based on the -2 pattern. D: ISP is incorrect because both second and third letters are wrong based on the -2 pattern.
A is correct because applying the +2, -2, -2 pattern to the final cluster GTS results in I, R, and Q respectively.
In alphabetical series, always treat each position (1st, 2nd, 3rd) as a separate sub-series; this prevents confusion and reduces errors significantly.