Question

5, 11, 17, ....., 31, 41
(2) 19 (b) 21
(c) 23 (d) 25
7, 13, 21, ..., 43, 57
(a) 27 (6)
(c) 31, (d) 35
3, 15, 35, ....... 99, 143
​

Answer 1

7+6=13

13+8=21

43+14=57

so,21+12=33

7,13,21,43,57