a survey of 85 students ask them about the subjects that they liked to study. 35 students liked math, 37 like history and 26 like physics, 20 like Math and history, 14 like Math and physics and three liked history and physics to students like all three subject
a) how many of this students like math or physics
b) how many of this students didn't like any of three subject
c) how many of this students like math and history but not physics ​