What should come in place of question mark?
5
6
7
8
Solution
$72 = (7)^3 - (2)^2 = 343 – 4 = 339 = 3 + 3 + 9 = 15$
$84 = (8)^3 - (4)^2 = 512 – 16 = 496 = 4 + 9 + 6 = 19$
$88 = (8)^3 - (8)^2 = 512 – 64 = 448 = 4 + 4 + 8 = 16$
$51 = (5)^3 - (1)^2 = 125 – 1 = 124 = 1 + 2 + 4 = 7$
$48 = (4)^3- (8)^3 = 64 – 64 = 0$
$42 = (4)^3 - (2)^3 = 64 – 4 = 60 = 6 + 0 = 6$
$86 = (8)^3 - (6)^3 = 512 – 36 = 476 = 4 + 7 + 6 = 17$
$89 = (8)^3 - (9)^3 = 512 – 81 = 431= 4 + 3 + 1 = 8$