Question

A bag contains 24balls of which 'x' are red , 2x are white and 3x are blue . A ball is selected at random . What is the probability that is
(I) not red (ii) white

Answer 1

Total no. of balls =24
x+2x+3x=24
6x=24
x=4
No. of red balls =4
No. of white balls =2×4=8
No. of blue balls =3×4=12
1. No. of balls that are not red=8+12=20
Probability=20/24=5/6
2.Probability=8/24=1/3.
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Answer 2

There are  x red balls,  2x white balls and   3x blue balls.  Total = 6x.

1) Probability ( the ball is not red )
       = Probability (the ball is blue or white)
       = (2x + 3x) / (6x)
       = 5/6
       
2)  Probability (the ball is white)
      = 2x / 6x
      =  1/3