A club has 15 members and needs to choose 2 members to be co-presidents.  In how many ways can the club choose its co-presidents?
Question:
A club has 15 members and needs to choose 2 members to be co-presidents.  In how many ways can the club choose its co-presidents?
Answer:
Let's think step by step.

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A club has 15 members and needs to choose 2 members to be co-presidents.  In how many ways can the club choose its co-presidents?
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