CGPSC 2012 · Question 50 of 66

Q56. Which of the following numbers will replace the question mark sign in the series 3, 20, 63, 144, 275, ?

Mental Ability

A520
B468Correct
C648
D378
E560

Answer: B. 468

Explanation

Successive differences are 17, 43, 81, 131 with second differences 26, 38, 50 (rising by 12); the next difference is 131 + 62 = 193, so the next term is 275 + 193 = 468.

Source: CGPSC Prelims 2012 GS Paper-II (held 9-6-2013), solved paper

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