In one particular race there are 7 people 3 of which are

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In one particular race there are 7 people, 3 of which are runners of the track coach. The race is so competitive that any outcome is as equally likely as another. What is the probability that at least 2 of his runners(the track coach) finishes in the top 3?

Need help with working this out I would like a good detailed explanation.

Reference no: EM13616411

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