Question

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 balls in the jar.

Answer 1

2/3 = x/24
24×2 = 3x
x = 16..
green balls = 16
blue balls 24-16
=8.
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Answer 2

So there are total 24 marbles
Probability of green marbles is 2/3
We know that probability of an event always lie between 0 and 1.
so probability of blue marbles is 1 - 2/3
That is 1/3
So 1/3 of 24 will be the no. of blue marbles in the jar.
Therefore the no. of blue marbles is 8.

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