SSC CGL 22 AUGUST 2017 REASONING QUESTION 9 SHIFT 3

9.A series is given, with one word missing. Choose the correct alternative from the given ones that will complete the series.
-0.5, -0.35, -0.2, -0.05, ? , 0.25
Options:
1. -0.1
2. 0.1
3. 0.15
4. -0.15
Answer: 2

Add 0.15 to each term to get next term
-0.5, -0.35(-0.5 + 0.15), -0.2(-0.35 + 0.15), -0.05(-0.2 + 0.15), ?(-.05 + 0.15 = 0.10) , 0.25