Discussion
What should come in place of the question mark (?) in the given series in order to make it logically complete? F P 11, I M 13, L J 17, ?, R D 23
Answer: B
In each term the first letter moves three places forward, the second moves three places back and the number is the next prime: F P 11, I M 13, L J 17, then O G 19, and R D 23 follows.
\[ L+3=O,\ J-3=G,\ \text{next prime after } 17 = 19 \]
The missing term is O G 19. The options with 21 break the prime sequence, and P H or P G shift the first letter by four places.
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