Question 314836
a o b = a x b + a - b

2 o 5 = 2X5 + 2 - 5 = 7

5 o 2 = 5X2 + 5 - 2 = 13

Hence,

( 2 o 5 ) o ( 5 o 2 )= 7 o 13

			= 7X13+7-13=85