Choose the missing term out of the given alternatives
C4X, F9U, I16R, ?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → L25O
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 C, F, I (3, 6, 9):
3 places ahead each time
So the next is 12th, L
Numbers 4, 9, 16:
The squares \(2^2, 3^2, 4^2\)
So the next is \(5^2=25\)
Last letters X, U, R (24, 21, 18):
3 places back each time
So the next is 15th, O
The missing term is L25O.