Question

a box contains 7 red ball, x green balls 2 while balls ,if the probability of picking green ball is 1/4 find number of green balls​

Answer 1

Answer:

Step-by-step explanation:

Total no ball,N(S)=7+2+x=9+x

no of green ballsN(E)=x

Probability of getting green ball,P(E)=1/4

Now,

P(E)=N(E)/N(S)

1/4=x/9+x

1(9+x)=4(x)

9+x=4x

3x=9

Therefore,

x=3

Answer 2

Answer:

3

Step-by-step explanation:

Red balls =7

Green balls =x

White balls =2

p(green balls)=favourable outcomes/total outcomes

: 1/4=x/9+x

therefore by cross multiplying.... x=3