| Question | Select the number that can replace the question mark (?) in the following series. 6, 9, 14, 21, 30, 41, ? | |
| Type | multiple_choice | |
| Option | 53 | incorrect |
| Option | 57 | incorrect |
| Option | 49 | incorrect |
| Option | 54 | correct |
| Solution | Series follows +3, +5, +7, +9, +11, +13 | |
