Question

A bag contains 5 red balls and some blue balls.if the probability of drawing a blue ball from the bag is thrice that of a red ball, find the number of blue balls in the bag.​

Answer 1

Step-by-step explanation:

Let number of blue balls in the bag =x

Total no of balls in bag =5+x  [No. of redball =5]

Probability of drawing a blue ball =  No. of blue ball /Total no of ball

P(B)=x /  5+x

Probability of drawing a Red ball =  No. of red ball /Total no of ball

P(R)=5/  5+x

Given,

P(B)=2P(R)

x /5+x  =2(  5 /5+x  )

x=10

​Hence, no. of blue balls in the bag =10.

Answer 2

Answer:

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