\"\"

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Situation:

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Choosing team captains for a football team .

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Conclusion:

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Total number of team captains are \"\",then \"\".

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From the choosing team captians for a football, So \"\".

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Combination:

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A selection of objects in which order is not important is called a combination.

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Therefore, the situation is combination, because the captains for a football team does not matter.

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\"\"

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Combination.