What is X in the sequence 1, 3, 6, 11, 18, X, 42?

ಉತ್ತರ ತೋರಿಸು ಮತ್ತು ವಿವರಣೆ

ಉತ್ತರ: (C) 29

ವಿವರಣೆ

Differences are primes 2, 3, 5, 7, 11, 13: 18 + 11 = 29, 29 + 13 = 42. (Answer as per the official UPSC answer key.)