SSC CGL (Prelims) Reasoning: Number Classification questions with solutions

Q1. Three of the following number-pairs are alike in some manner and hence form a group. Which number-pair does not belong to that group?

1. 17-306
2. 21-462
3. 14-196
4. 12-156

Answer: 14-196

In 17-306, 306 = 17 × 18; in 21-462, 462 = 21 × 22; in 12-156, 156 = 12 × 13. But 196 = 14 × 14, so it does not follow the same pattern as the others.