1.  Which one will replace the question mark ?

A. 0
B. 2
C. 11
D. 12

Answer: Option C

Explanation:

(6 + 5) - (7 + 4) = 0

and (7 + 6) - (8 + 4) = 1

Therefore (11 + 2) - (2 + 0) = 11.