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Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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Find the missing term: AZ, CX, EV, GT, ?
IR
IS
HS
HR
IR
Observe the first letters as an increasing sequence (A, C, E, G → +2) and the second letters as a decreasing sequence (Z, X, V, T → -2).
Observe the first letters as an increasing sequence (A, C, E, G → +2) and the second letters as a decreasing sequence (Z, X, V, T → -2).
Analyze the first letter of each cluster
The first letters follow a pattern of skipping one letter: A (+2) → C (+2) → E (+2) → G (+2) → I. The next letter is I.
Analyze the second letter of each cluster
The second letters follow a pattern of reverse alphabetical movement: Z (-2) → X (-2) → V (-2) → T (-2) → R. The next letter is R.
B: IS is incorrect because the second letter must be T-2 = R, not S. C: HS is incorrect as it violates both the +2 first-letter rule and the -2 second-letter rule. D: HR is incorrect because the first letter must be G+2 = I, not H.
A is correct because the series follows a consistent +2 progression for the first letter (A, C, E, G, I) and a -2 progression for the second letter (Z, X, V, T, R).
For alphabetical series, always write the numerical positions (A=1, Z=26) on your rough sheet; it reduces mental calculation errors significantly in time-pressured exams.
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