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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 of the bag contains 20 black balls, then find the total
number of balls in the bag
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Answer:
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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