What comes in place of the question mark (?) in the series given below?
B2D, C3F, E5J, G7N, ?, M13Z
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → K11V
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.
Numbers 2, 3, 5, 7, ?, 13:
They are the prime numbers in order
So the missing number is 11
First letters B (2), C (3), E (5), G (7), ?, M (13):
Each letter’s place in the alphabet is the number beside it
So the missing letter is the 11th letter, K
Last letters D (4), F (6), J (10), N (14), ?, Z (26):
Each letter’s place is twice the number in the term
So the missing letter is the \(2\times11=22\)nd letter, V