Question:
In the following alpha-numeric series, which option replaces the question mark (?): AZ2, CX4, EV8, GT16, ?
In the following alpha-numeric series, which option replaces the question mark (?): AZ2, CX4, EV8, GT16, ?
Updated On: Sep 16, 2026
- HS32
- JT20
- IR32
- JR32
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The Correct Option is C
Solution and Explanation
Concept:
Step 1: Find the rule for the first letters.
A, C, E, G ... each letter skips exactly one letter of the alphabet (A to C skips B, C to E skips D, and so on).
Continuing the same jump after G (skip H) gives I.
Step 2: Find the rule for the second letters.
Z, X, V, T ... in numeric terms these are 26, 24, 22, 20, each falling by 2.
Continuing the fall by 2 after T (20) gives 18, which is R.
Step 3: Find the rule for the numbers.
2, 4, 8, 16 ... each number is double the previous one.
Continuing this doubling after 16 gives 32.
Step 4: Combine the three parts to build the missing term.
First letter = I, second letter = R, number = 32, giving IR32.
Final Answer: IR32 (option 3)
- An alpha-numeric series like this actually runs three independent series together: the first letters, the second letters, and the numbers.
- Work out the rule of each mini-series separately, then combine the three answers to get the missing term.
Step 1: Find the rule for the first letters.
A, C, E, G ... each letter skips exactly one letter of the alphabet (A to C skips B, C to E skips D, and so on).
Continuing the same jump after G (skip H) gives I.
Step 2: Find the rule for the second letters.
Z, X, V, T ... in numeric terms these are 26, 24, 22, 20, each falling by 2.
Continuing the fall by 2 after T (20) gives 18, which is R.
Step 3: Find the rule for the numbers.
2, 4, 8, 16 ... each number is double the previous one.
Continuing this doubling after 16 gives 32.
Step 4: Combine the three parts to build the missing term.
First letter = I, second letter = R, number = 32, giving IR32.
Final Answer: IR32 (option 3)
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