In the following question, an alphanumeric series is given as
5FU, 9IS, 13LQ, ?, 21RM
Choose the missing term (?) out of the given alternatives.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 17OO
Take the three parts of each term separately. The numbers run 5, 9, 13, ?, 21 — increasing by 4, so the missing number is 17. The first letters are F, I, L, ?, R, whose positions 6, 9, 12, ?, 18 increase by 3, giving position 15, the letter O.
The second letters are U, S, Q, ?, M, whose positions 21, 19, 17, ?, 13 decrease by 2, giving position 15, again the letter O. The missing term is therefore 17OO.