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Probability

Question

An urn contains 7 red and 4 blue balls. Two balls are drawn at random with replacement. Find the probability of getting 2 blue balls.

Solution

Number of red balls = 7
Number of blue balls = 4
$therefore space space space space total space number space of space balls space equals space 7 plus 4 space equals space 11$
P(2 blue balls) = $4 over 11 cross times 4 over 11 space equals space 16 over 121$

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Probability

An urn contains 7 red and 4 blue balls. Two balls are drawn at random with replacement. Find the probability of getting 2 blue balls.

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