What is the purpose of an index in a

What will come in place of the question mark (?) in the following series?

1528, 1416, 1204, ?, 480, -32

143        119      107      101       98      ?

96 89 ? 90 94 91

What value should come in the place of (?) in the following number series?

19, 235, 260, 324, 333, ?

What will come in place of the question mark (?) in the following series?

In each of the following number series, one term is missing. Find the missing term.

3, 5, 20, 24, 144, 150, ?

1029, 1030, 1039, 1064, ?, 1194

75,  80,  95, ?,  155,  200

What will come in place of the question mark (?) in the following series?

1515, 184, ?, 455, 967, 624

7 29 61 ? 211 349