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
Each term has three parts, a number, a first letter and a second letter, and each part follows its own rule. Letters are read by their place in the alphabet (A = 1, ..., Z = 26).
Numbers 5, 9, 13, ?, 21: each is 4 more, so the missing number is 17
First letters F (6), I (9), L (12), ?, R (18): each is 3 places ahead, so the missing letter is 15, which is O
Second letters U (21), S (19), Q (17), ?, M (13): each is 2 places back, so the missing letter is 15, which is O