| Question | Select the number from among the given options that can replace the question mark (?) in the following series. 5, 11, 25, 55, 117, 243, ? | |
| Type | multiple_choice | |
| Option | 473 | incorrect |
| Option | 437 | incorrect |
| Option | 479 | incorrect |
| Option | 497 | correct |
| Solution | 5 + 6 = 11 11 + 14 (6 × 2 + 2) = 25 25 + 30 (14 × 2 + 2) = 55 55 + 62 (30 × 2 + 2) = 117 117 + 126 (62 × 2 + 2) = 243 243 + 254 (126 × 2 + 2) = 497 | |
