13, 25, 61, 121, 205, ?
875 05ea6d338fb6adc33ce5ca8075ea6d338fb6adc33ce5ca807What will come in place of the question mark (?) in each of the following series?
15 18 16 19 17 20 ?
1522 05eb150945a48d373519c8cacDirection : What should come in place of the question (?) in the following question.
15 34 20 ? 25 43 30
1022 05fd9c419bc259a5735cb2f4a