What should come in the place of the question mark (?) in the following alphanumeric series?

A1X, B4P, E25J, J100F, ?

Q289D

The correct answer is Option (3) → Q289D

A1X, B4P, E25J, J100F, ?

If we see in middle of each term there is 1, 4, 25, 100 and these are squares of 1, 2, 5, 10 and the difference between next term and previous term is 1, 3, 5 so the next difference must be 7.

So the next middle term must be the square of (10+7)² = 289

First alphabet series A, B, E, J so the next must be Q.

There is only one option starting with Q289 so no need to check last alphabet series.