P(math) = 0.85
P(phy) = 0.4
P ( phy+math ) = 0.3
P(not passing both ) =1-(0.85 +0.4 - 0.3 )
= 0.05
now passing both = 0.3
and passing physics = 0.4
so passing only physics = 0.4 - 0.3 = 0.1
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