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Evgen [1.6K]
3 years ago
9

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.
Mathematics
1 answer:
gavmur [86]3 years ago
6 0
I believe 156 because each person would have had to make 12 phone calls and there are 13 people so 12x13
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