1.  Which one will replace the question mark ?
A. 94
B. 76
C. 16
D. 73

Answer: Option A

Explanation:

(4)2 + (2)2 + (1)2 = 21

and (5)2 + (3)2 + (8)2 = 98

Therefore (6)2 + (7)2 + (3)2 = 94.