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30 March, 04:06

A spider must eat 3 flies a day to survive. After he has taken his three he quits for the day. For any fly that crosses his path, he has a 50% chance of nabbing that fly. Given that five flies have sailed past the spider today (some surviving and some not), find the chance of survival of next fly.

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  1. 30 March, 07:57
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    The answer is 0.75.

    (1/2) * 1 + (1/2) * 0.5 = 0.75
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