SSC CHSL 29 JAN 2017 SHIFT 3 TIER 1 REASONING QUESTION 11

11.A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
130, 450, 970, 1690, ?
Options:
1) 6210
2) 2601
3) 2600
4) 2610

Answer: 4 (2610)

Sol:

450 - 130 = 320
970 - 450 = 520
1690 - 970 = 720

X - 1690 = 920 => x = 920 + 1690 => x= 2610