2187, 729, 243, 81, 27, 9, ?

So, 3 will come at the place of question mark.

12, 6, 6, 9, 18, 45, ?

Series Pattern is ---> *.5,*1,*1.5,*2,*2.5,

So missing series = 45* 3 = 135

2, 10, 30, 68, 130, 222, ?

The numbers are formed as 1

7, 10, 16, 25, 37, ?

The pattern of the series is

7+3=10

10+2×3=16

16+3×3=25

25+4×3=37

37+5×3=52

15 22 36 57 85 ?

22 -1 5 = 7

36 – 22 = 14 =(7×2)

57 – 36 = 21 = (7×3)

85 -57 = 28 = (7×4)

Hence in every subsequent step difference is multiplied by 7.

Therefore the next difference will be (7×5)=35

Hence ? =85+35 = 120

37, ?, 103, 169, 257, 367

37 ? 103 169 257 367

37 + 22 = 59

59 + 44 = 103

103 + 66 = 169

169 + 88 = 257

257 + 110 = 367

Thus, 37 59 103 169 257 367

Hence, option D is correct.

540, 108, 27, 9, (?)

The pattern is = *1/5, *1/4, *1/3,

So the missing term is = 9*1/2 = 4.5

10, 15, 11, 16, 12, 17, (?)

The pattern is = +5 -4 +5 -4 +5

So the missing term is = 17 – 4 = 13

14, 15, 23, 32, 96, ?

14 + 1^2 = 15; 15 + 2^3 = 23

23 + 3^2 = 32; 32 + 4^3 = 96

96 + 5^2 = 121

26, 35, 50, 63, 82, 99, (?)

The pattern is = 5^{2}+1, 6^{2}-1, 7^{2}+1, 8^{2}-1, 9^{2}+1, 10^{2}-1,

So the missing term is =112+1, = 122