What comes next in the following series?
z4, y9, x25, w49, v121, ?
Show answer & explanation
Correct answer: B
Explanation
Series: Z4, Y9, X25, W49, V121, ?
The letters are: Z, Y, X, W, V, ?
These letters are in reverse alphabetical order:
Z → Y → X → W → V → U
So, the next letter should be U.
Analyze the number pattern:
The numbers are: 4, 9, 25, 49, 121, ?
The sequence of square roots is: 2, 3, 5, 7, 11 — these are consecutive prime numbers.
The next prime after 11 is 13, and 13² = 169.
So, the next term is U169.
Hence, option (2) is the correct answer.