How many different two-person sub-committees can be selected from a committee of six people (the order of choosing the people does not matter)?
Question:
How many different two-person sub-committees can be selected from a committee of six people (the order of choosing the people does not matter)?
Answer:
Let's think step by step.

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How many different two-person sub-committees can be selected from a committee of six people (the order of choosing the people does not matter)?
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