Quantitative Aptitude Questions for for SBI PO Prelims

Direction Q.( 1-5) What should come in place of question mark (?) in the following number series?

1.6, 9, 15, 21, ?, 39 (4)

1.27

2.29

3.31

4.33

5.35

2.1, 1, 3, 9, 13, 65, 71, ?, 505 (4)

1.197

2.297

3.397

4.497

5.597

3.1, 2, 6, 42, ?, 3263442 (2)

1.1405

2.1806

3.2135

4.2995

5.1905

4.1, 5, 14, 30, 55, 91, 140, ? (3)

1.184

2.194

3.204

4.214

5.224

5.5, 31, 129, 391, 785, 787, ?, −1, 1, −517 (1)

1.1

2.7

3.913

4.997

5.1013