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Question

# A box contains 5 red and 4 white marbles. Two marbles are drawn successively from the box without replacement and the second drawn marble drawn is found to be white. Probability that the first marble is also while is?

A
38
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B
12
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C
13
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D
14
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Solution

## The correct option is A 38Given:Box has 5 red + 4 white =9 ballsTwo marbles are drawn without replacement.To find:The probability that the first marble is also white.The second ball drawn is white hence white ball left =3. And total ball left =8Hence the probability that the first marble is also white is 38

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