| Question | Select the number from among the given options that can replace the question mark (?) in the following series. 11, 13, 19, 45, 91, 157, ? | |
| Type | multiple_choice | |
| Option | 243 | correct |
| Option | 297 | incorrect |
| Option | 349 | incorrect |
| Option | 494 | incorrect |
| Solution | 11 + 2 = 13 13 + 2 × 3 = 19 19 + 2 × 13 = 45 45 + 2 × 23 = 91 91 + 2 × 33 = 157 157 + 2 × 43 = 243 11, 13, 19, 45, 91, 157, 243. | |
