(Q4) A jar contains 24 marbles, some are green and others are blue. If a marble is drawn at random from the jar, the probability that it is green is 2/3. Find the number of blue marbles in the jar.

Answer :

Total number of marbles in the jar = .

Let the number of green marbles = x.

Then number of blue marbles = - x.

Probability of drawing a green marbles =
No. of favourable outcomes
Total no. of outcomes
 =
x

By Problem,

x
 =
2
3

3x = × 2

x =
3
 =

∴ Number of green marbles =

Number of blue marbles = - =

∴ Probability of picking blue marble =
=
1