30. A bag contains 18 balls out of which x balls are red and remaining balls are white.
(i) If a ball is drawn at random from the bag. What is the probability that it is not red?
(ii) If 2 more white balls are put in the bag, then the probability of drawing a white ball will
be 9/8 times the probability of drawing a white ball in the first case. Find the value of x.
Answers
Answered by
1
Answer:
8
Step-by-step explanation:
bag contains =18 balls
no. of red balls =x
Probability of red ball =
total no of ball
Favourable ball
(i) P[red ball]=
18
x
(ii) If two more red ball add
no. of red ball =x+2
total no. of balls =18+2=20
Probability of druuing red ball =
8
9
Probability of red ball coming in part (i)
∴
20
x+2
=
8
9
×
18
x
∴
20
x+2
=
16
x
∴ 16(x+2)=20 x
∴ 16 x+32=20 x
∴ 20 x−16 x=32
∴ 4 x=32
∴ x=8
→ the value of x=8
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