a bag contains white, black, and red balls only. If a ball is drawn at random from the bag p(w) =2/5, p(b) =1/4 also number of red balls is 42 find no of each
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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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