41. A bag contains, white, black and red balls only. A ball is drawn at random from the bag. If the probability of
getting a white ball is 3/10 and that of a black ball is 2/5, then find the probability of getting a red ball. If the
bag contains 20 black balls, then find the total number of balls in the bag.
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3/10
The probability of white ball =3/10
the probability of black ball =2/5
The probability of ball other than red =3/10+2/5
=7/10
the probability of Red Ball = 1-7/10
=3/10
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