Question

A bag contain 15 balls.Out of these,some are red and the others are blue in colour. The

irobability of drawing a blue ball is 1/5.Find the number of red balls in the bag.​

Answer 1

Answer:

we have the probability of blue ball is 1/5

we know that P(E)+p( not e ) =1

= p(not e) = 1- P(E)

= " = 1-1/5

= " = 5-1/5

= p( not e)= 4/5

thus , the probability of red balls = 4/5

hope it helps uu

Answer 2

Step-by-step explanation:

Total balls =15

P(Red)=15-x

15

P(Blue)= x

15

when 5 red balls are added

( 15-x)×2= 20-x

15 20

600−40x=300−15x

300=25x

x=12

There are 12 blue balls and 3 red balls

P(red balls)= 15=5

3 1

P(blue balls)= 15=5

12 4

P(blue ball if 5x balls are actually added)=1−2×( 5)=5

1 3