Question

A bag contains $25$ balls of which $x$ are red, $2x$ are white and $3$ are blue . A ball is selected at random , what is the probability that it is (i) not red? (ii) white?

Answer 1

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