A bag contains white, black and red balls. 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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P (of red ball) =1−(
10
3
+
5
2
)
=1−(3+
10
4
)
=1−
10
7
=
10
10−7
P (of red ball) =
10
3
No. of black balls =
totalno.ofballs
20
5
2
=
totalno.ofballs
20
⇒50 = total no. of balls
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