Question

a bag contain 40 balls out of which 15 are black then probability of a ball not black is

Answer 1

***Hey friends***
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here is your answer
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no. of balls in bag is 40
no. of black balls is 15
no. of balls not black is 40-15 i.e., 25
p(balls not black) is 25/40 = 5/8...
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Answer 2

Let the total number of balls be s(n) =40
Let n(e) be the black black balls in bag=40-15=25
Let p(E) be the probability of getting black balls
p(E) = s(n)/n(e)
=25/40
=5/8

Hope so you understood
Thank you