| Question | Select the option in which the numbers are related in the same way as are the numbers of the following set. (12, 30, 61) | |
| Type | multiple_choice | |
| Option | (8, 21, 45) | incorrect |
| Option | (14, 35, 72) | incorrect |
| Option | (6, 15, 30) | incorrect |
| Option | (18, 45, 91) | correct |
| Solution | (12, 30, 61) = (12, 12 × 2.5, 30 × 2 + 1) Similarly, (18, 45, 91) = (18, 18 × 2.5, 45 × 2 + 1) | |
