Question

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 ballis 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​

Answer 1

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

Answer 2

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