Find out the missing number in the following sequence : 1, 3, 3, 6, 7, 9, ?, 12, 21. (1) 10 (2) 11 (3) 12 (4) 13
What should come in place of the question mark (?) in the following number series? 11, 14, 23, 50, ?
1) 111 2) 121 3) 151 4) 131
1, 6, 13, 22, 33, (...) (1) 44 (2) 45 (3) 46 (4) 47
6, 11, 21, 36, 56, (...) (1) 42 (2) 51 (3) 81 (4) 91
