Question 305589
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You are exactly right.  Since you replaced the marble drawn on the first draw, the probabilities on each of the first and second draws are identical.  Therefore, the probability of getting a red marble on the first draw is equal to the probability of getting a red one on the second draw, and the probability of both being red is the product of the two probabilities.  That means the probability of the individual draws is the square root of the overall probability.


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \sqrt{\frac{1}{25}}\ =\ \frac{1}{5}]



John
*[tex \LARGE e^{i\pi} + 1 = 0]
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