Directions (1–5): What should come in place of the question mark (?) in the following number series ?
1. 1, 9, 25, 49, ?, 169 (4)
(1) 100
(2) 64
(3) 81
(4) 121
(5) None of these
2. 3, 23, 43, ?, 83, 103 (3)
(1) 33
(2) 53
(3) 63
(4) 73
(5) None of these
3. 748, 737, 715, 682, 638, ? (5)
(1) 594
(2) 572
(3) 581
(4) 563
(5) None of these
4. 121, 117, 108, 92, 67, ? (1)
(1) 31
(2) 29
(3) 41
(4) 37
(5) None of these
5. 50, 26, 14, ?, 5, 3·5 (2)
(1) 6
(2) 8
(3) 10
(4) 12
(5) None of these
