Question

A bag contains 40 balls , of then are red , some are yellow and the rest are black . The probability of drawing a red ball and a yellow ball are 1/4 and 2/5 respectively .

On the basis of above information, answer the following questions :-
1. what is the probability of drawing a black ball at random from the bag:
a.7/20 b.1/4 c.3/5 d.1/2
2.The number of Yellows balls in the bag is:
a.18 b.24 c.12 d.15
3.What is the probability of drawing a black ball at random of the bag is:
a.7/24 b.7/12 c.5/24 d.9/48
4.What is the probability of drawing a red ball is:
a.5/24 b.1/4 c.7/12 d.3/4​

Answer 1

Step-by-step explanation:

Let no. of red balls = x, no. of blue balls =y and no.of black balls = z.

Probability of drawing a red ball = P (red ball) =

11

20

=

x

40

⇒

x=22

Probability of drawing a blue ball = P (Blue ball) =

1

5

=

y

40

⇒

y=8

∴

No of black balls = 40- 22 -8 =10

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