Asked by Mike

A group of 13 friends were planning a trip. On night before they made lot of phone calls. Each friend talked to every other friend atleast once. what is fewest phone calls that can be made?

Answers

Answered by Ms. Sue
13 * 12 = ?

Answered by Mike
thank you Ms. Sue. But how did you arrive to 13*12? can you please explain - i did not understand
Answered by Ms. Sue
Each of the 13 friends called 12 other people.

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