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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?
10 years ago

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Ms. Sue
13 * 12 = ?

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

10 years ago

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