Question

A bag contains 3 red balls, 5 black balls and 4 white balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is Not red

Answer 1

Total number of possible outcomes = 12 {3 red balls, 5 black balls & 4 white balls}

E ⟶ event of getting red

No. of favourable outcomes = 3 {3 black balls}

Probability, P(E) =`"No.of favorable outcomes"/"Total no.of possible outcomes"`

P(E) =3/12 =1/4

`barE` ⟶ event of not getting red.

P`(barE)` = 1 – P(E)

= 1–(1/4)
=3/4