18. A vending machine contains cans of grapefruit juice that cost 75 cents each, but it is...

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18. A vending machine contains cans of grapefruit juice that cost 75 cents each, but it is not working properly. The probability that it accepts a coin is 10%. Angela has a quarter and five dimes. Determine the probability that she should try the coins at least 50 times before she gets a can of grapefruit juice.

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JAPHETH KOGEI

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