Directions (Q. Nos. 1 – 4): What should come in place of question mark (?) in the following number series?
1.7, 35, 105, 525, 1575, 7875, ? (2)
(1) 39375
(2) 23625
(3) 11815
(4) 15750
(5) None of these
2.0, 5, 24, 75, 152, ? (1)
(1) 153
(2)304
(3) 308
(4) 312
(5) None of these
3.17,19, 21, 22, 25, 25, 29, 28, ? (3)
(1)31
(2)32
(3)33
(4)34
(5) None of these
4.1648, 24, 72, 36, 108, ? (5)
(1)148
(2)196
(3)216
(4)224
(5) None of these