Which number should replace the question mark (?) in the following number series?
5475, 1100, 225, 50, ?, 8, 6.6

The missing number in the series 28, 33, 31 ?, 34,39 is

Find the missing terms in the following series:
2, 15, 4, 12, 6, 7, ?, ?

Find the missing value '?'
4, 23, 60, 121,  ?

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, ?

Find the next number in the series:
9,20,38, 65, ?

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

What will come in place of the question mark (?) in the given series?
103 119 135 151 167?

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