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Two marbles are drawn without replacement from a box with 3 white, 2 green, 2 red, and 1 blue marble. Find the probability that the second marble is red when given the first marble is white.

Sagot :

Answer:  2/7

Explanation:

3 white + 2 green + 2 red + 1 blue = 8 total

We're told the first marble is white, so there are now 8-1 = 7 total

The probability of picking red on the second selection, based on the given info, is 2/7 since we have 2 red marbles out of 7 total leftover. The answer would be 2/8 = 1/4 if we didn't know what the color of the first marble was.

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