A series is given,with one term missing. Choose amongst the given responses choose the meaningful one

206, 221, 251, 296, ?, 431

In the following question, select the missing number from the given series.

1, 3, 5, 7, ?

In the following question, select the missing number from the given series.

964, ?, 241, 120.5, 60.25

In the following question, select the missing number from the given series.

24, 26, 28, ?, 32, 34

In the following question, select the missing number from the given series.

9, 11, 14, 16, 19, 21, ?

Choose the correct alternative which will complete the following series:

21, 55, 19, 50, 17, 45, ?

In the following question, select the missing number from the given series.

13, 17, 26, 42, 67, ?

Select the correct option will complete the given number series.

13, 10, 7, 4, ___

In the following question, select the missing number from the given series.

7, 11, 15, 19, 23, ?