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Question

What comes next in the following series?

A1, B8, A27, B64, ?

This question was previously asked in
SSC CHSL 2025 Tier 1 Question Paper (21-Nov-2025) (Shift 1)
The correct answer is

A125

This is a mixed (alphanumeric) series, so we analyse the letters and the numbers separately.

The letters run A, B, A, B, ... alternating between A and B.

After the fourth term B, the alternation returns to A, so the next letter is A.

Now look at the numbers: \(1, 8, 27, 64, \ldots\)

These are perfect cubes: \(1=1^{3},\ 8=2^{3},\ 27=3^{3},\ 64=4^{3}\).

The next cube is \(5^{3}=125\).

Combining the next letter A with the next number 125 gives \(A125\).

Hence the term that comes next in the series is A125.

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Similar Questions

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Important Questions from Mixed Series

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