Find the missing letter from the following. B | G | N D | J | R G | N | ?

Find missing number (?) from the following sequence. 4, 14, 30, 52, ?, 114

Find the missing number (?) from the following figure. 12 | 12 | 18 16 | 12 | 20 5 | 12 | ? 197 | 156 | 366

Find the missing number from the following alternatives. 21 | 24 | 36 11 | 14 | 12 3 | ? | 4 77 | 112 | 108

Find the missing number in the following number series. 3, 5, 8, 10, ?, 15, 18, 20

Find the missing number in the following series. 2/3, 4/7, ?, 11/21, 16/31