SOLUTION: The probability of randomly selecting a red marble from a bag, replacing it, and selecting a red marble again is 1/25. Suppose you know there are 2 red marbles originally in the ba
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Question 305605: The probability of randomly selecting a red marble from a bag, replacing it, and selecting a red marble again is 1/25. Suppose you know there are 2 red marbles originally in the bag. How many marbles are in the bag?
Would the answer be 2?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
You have already calculated that the probability of drawing a red marble on one draw is 
. Since you know there are 2 ways to be successful, what do you need in the denominator so that the fraction with a numerator of 2 is equal to ?
Super-Deluxe-Double-Plus Extra Credit. From what you have been given so far, do you know anything about how many other colors of marbles are in the bag?
John
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