| Question | Four number-pairs have been given, out of which three are alike in some manner and one is different. Select the number- pair that is different. | |
| Type | multiple_choice | |
| Option | 42, 72 | incorrect |
| Option | 132, 182 | incorrect |
| Option | 20, 42 | incorrect |
| Option | 56, 63 | correct |
| Solution | 42 → 7×6 → 8×9⇒72, 132→11×12→13×14⇒182, 20→5×4→6×7 ⇒ 42, 56→7×8→9×10⇒90≠63. | |
