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# 4 people talked on the phone. each person talked to everyone ONCE. how many conversations took place?

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- Anonymous9 years agoFavorite Answer
That would be...

6 conversations!

Use combination formula...

nCr

Let...

n = 4 and r = 2, so 4C2 = 6

I hope this helps!

Source(s): Σ - John AdriaanLv 69 years ago
Call the people A, B, C and D

A talks to B, then C then D. That's 3 conversations.

B can't talk to A, but talks to C and D. That's 2 more conversations.

C can't talk to A or B, so talks to D. That's 1 more conversation.

D has already spoken to everyone. That's 0 more conversations.

There were 3+2+1 = 6 conversations.

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- 9 years ago
i'm pretty sure it's 12. Cause each person talked to 3 other people. there were 4 people. 4X3 =12

Sorry if I'm wrong. didn't really try

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