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The probability of a missile hitting the target successfully in a trial is 0.2. Five successful hitting are needed to destroy a particular target. What is the probability that the target will be destroyed in the 7th trial?

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    Does this mean exactly that the 7th missile destroys it, or that it could already be destroyed by missile 5 or 6?2012-09-09
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    My comment [on your other question](http://math.stackexchange.com/q/193073/6179) fully applies.2012-09-09

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