Question

A box contains 3 blue, 2 white and 4 red marbles. If a marble is drawn at random from the box, what is the probability that it will not be a white marble?

Answer 1

the probability of white marble is=

total condition =3+2+4=9

favourable condition =7

p(e.)=7/9

Answer 2

s={1b,2b,3b,1w,2w,1r,2r,3r,4r}

n(s)=9

A={1b,2b,3b,1r,2r,3r,4r}

n(a)=7

p(a)=n(a)

n(s)

p(a)=7

9