Question

A bag contains 80 balls. Some are
blue, red and white White balls are
12 times blue balls. Red balls are
more than blue balls
but less than
white balls. One ball is selected
find the probability that it is red.​

Answer 1

Step-by-step explanation:

S= {80}

n(S)=80

P(A)= 1/80

Answer 2

Answer:

28/80 or 15/80

Step-by-step explanation:

Assuming x as number of blue balls

12x= number of white balls

x<number of red balls<12x

number of red balls=kx (divide x on both sides)

x<kx<12x   1<k<12

Now, 12x+x+kx has to be divisible by 80 and it cannot be greater than 80.

13x+kx=80

x(13+k)=80 x=80/(13+k)

Replacing k with the inequality gives us a range for x:

80/14<x<80/25

But, as x has to be a whole number, x can only be 80/16 or 80/20 and so k =3 or 7

So x is 4 or 5.

So probability =28/80 or 15/80.