Mathematics
Ibrahim13579
11

There are four blue marbles, an unknown number of red (r marbles, and six yellow marbles in a bag. which expression represents the probability of randomly selecting a blue marble, replacing it, and then randomly selecting a red marble?

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(1) Answers
emmyloo

There are a total of [latex]4+r+6[/latex] marbles in the bag The probability of choosing a blue is [latex] \frac{4}{10+r} [/latex] The probability of choosing a red is [latex] \frac{r}{10+r} [/latex] The probability of choosing a blue, replacing it, and then a red is [latex] \frac{4}{10+r} [/latex]×[latex] \frac{r}{10+r} [/latex] = [latex] \frac{4r}{100+20r+ r^{2} } [/latex]

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