A group of 13 friends were planning a trip. On the night before they left they made a lot of phone calls. Each friend talked to every friend at least once. What is the fewest phone calls that would have been made.

Question

03-06-2021
Mathematics

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A group of 13 friends were planning a trip. On the night before they left they made a lot of phone calls. Each friend talked to every friend at least once. What is the fewest phone calls that would have been made.

Sagot :

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