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
