Choose the number which will come next in the following series.
3, 4, 13, 38, 87, 168, ?

What should come in place of the question mark (?) in the given series?
23, 24, 32, 59, 123, ?

What should come in place of the question mark (?) in the given series?
88, 91, 97, 106, 118, ?

What should come in place of the question mark (?) in the given series?
48, 51, ?, 54, 42, 57, 39

What should come in place of ? in the given series?
451, 338, 225, 112, -1, ?

In the sequence 20, 10, 10, 15, 30, 75, X, find the value of X.

In the following question, select the missing number from the given series :
13, 35, 73, 215, 433, ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
-36, -68, -132, -260, ?, -1028, -2052, -4100

Which of the following numbers will replace the question mark (?) in the given series?
111, 114, 119, ?, 135

What should come in place of the question mark (?) in the given series?
26 26 38 38 50 50 ?