What should come in the place of question mark (?) in the following alphanumeric series?
A1X, B4P, E25J, J100F, ?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Q289D
In a letter-number series, each part of the term follows its own rule, so the first letters, the numbers and the last letters are checked separately.
First letters A (1), B (2), E (5), J (10):
The gaps are 1, 3, 5 (odd numbers)
So the next gap is 7: \(10+7=17\), that is, Q
Numbers 1, 4, 25, 100:
They are the squares of the first letters’ positions: \(1^{2},\ 2^{2},\ 5^{2},\ 10^{2}\)
So the next is \(17^{2}=\) 289
Last letters X (24), P (16), J (10), F (6):
They fall by 8, 6, 4
So the next falls by 2: \(6-2=4\), that is, D