What should come in the place of the question mark (?) in the following alphanumeric series?
A1X, B4P, E25J, J100F, ?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Q289D
Each term has three parts, and each part follows its own rule.
First letters A (1), B (2), E (5), J (10): the gaps are 1, 3, 5, so the next gap is 7 and the letter is \(10+7=17\), Q
Numbers 1, 4, 25, 100: each is the square of the first letter’s position (\(1^{2}\), \(2^{2}\), \(5^{2}\), \(10^{2}\)), so the next is \(17^{2}=289\)
Last letters X (24), P (16), J (10), F (6): the gaps are 8, 6, 4 backwards, so the next gap is 2 and the letter is \(6-2=4\), D