Question

A bag contains white, black and red balls only. A ball is drawn at
3
random from the bag. If the probability of getting a white ball is
10
and that of a black ball is 25 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
[CBSE 2015]​

Answer 1

Here is Your answer..❤

P (of red ball) =1−( 10)

=1−(3+ 104 )

=1− 107

10−7

P (of red ball) = 103

No. of black balls = totalno.ofballs

= 20

totalno.ofballs

⇒50 = total no. of balls

Hope it helps..

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