| Question | Select the number-pair in which the two numbers share a different relationship from in that shared by the two numbers the rest of the number-pairs. | |
| Type | multiple_choice | |
| Option | 15 : 197 | correct |
| Option | 25 : 167 | incorrect |
| Option | 27 : 181 | incorrect |
| Option | 21 : 139 | incorrect |
| Solution | 15 : 197 = 15 : 15 × 13 + 2 25 : 167 = 25 : 25 × 7 – 8 27 : 181 = 27 : 27 × 7 – 8 21 : 139 = 21 : 21 × 7 – 8 Hence, option A is different. | |
