Which one will replace the question mark ?

Answer: Option D

Explanation:

How the number is obtained?

2 + 4 = 6

5 + 9 = 14

Similarly,

3 + 5 = 8

Therefore, the answer is K_{8}.

(5 + 4 + 7)/2 = 8

(6 + 9 + 5)/2 = 10

(3 + 7 + 2)/2 = 6.

Answer: Option C

(12 + 18 + 30)/10 = 6

(16 + 24 + 40)/10 = 8

Similarly, (45 + 18 + 27)/10 = 9.

(5 x 3) + 4 = 19

and (6 x 4) + 5 = 29

Therefore, (7 x 5) + 6 = 41

Answer: Option A

(15 x 2 - 3) = 27,

(31 x 2 - 6) = 56

and (45 x 2 - 9) = 81