Directions (1 – 5): What should come in place of question mark (?) in the following number series?
1. 15 18 16 19 17 20 ? (4)
(1) 23
(2) 22
(3) 16
(4) 18
(5) None of these
2. 1050 420 168 67.2 26.88 10.752 ? (1)
(1) 4.3008
(2) 6.5038
(3) 4.4015
(4) 5.6002
(5) None of these
3. 0 6 24 60 120 210 ? (5)
(1) 343
(2) 280
(3) 335
(4) 295
(5) None of these
4. 32 49 83 151 287 559 ? (3)
(1) 1118
(2) 979
(3) 1103
(4) 295
(5) None of these
5. 462 552 650 756 870 992 ? (2)
(1) 1040
(2) 1122
(3) 1132
(4) 1050
(5) None of these