The probability of a man hitting a targe...

The probability of a man hitting a target in one fire is `1/4`. How many times at least must he fire at the target in order that his chance of hitting the target at least once will exceed `2/3`?

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The probability of a man hitting a target in one fire is (1)/(5). Then the minimum number of fire he must follow in order-or-to make his chance of hitting the target more than (3)/(4) is

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A DAS GUPTA-Elementary Probability-Exercise

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