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Question

# A box contains 40 red and blue marbles. If a marble is drawn at random, the probability of picking a blue marble is 38. Ansh takes out one red and nine blue marbles and then draws a marble at random. Find the probability of drawing a blue marble

A
45
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B
25
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C
740
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D
15
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Solution

## The correct option is D 15A box contains 40 red and blue marbles. If a marble is drawn at random, the probability of picking a blue marble is 38. Ansh takes out one red and nine blue marbles and then draws a marble at random.The blue marbles are N=P(E)×total_marbles = 38∗40=15If he removes 1 blue and 9 blue marble then blue marbles are 15−9=6and total marbles are 40−10=30Hence Probability of finding the blue marble is P(E)=630=15

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