How many two-person conversations can occur at a party with 150 people?     conversations

Hello! if you have 150 people and you want to see how many two-person conversations are, then you need to see the combinatory between 150 and 2.

The combinatory between two numbers A and B is Where the combinatory between two numbers is all the possible combinations of A into groups of size B.

Then for 150 and 2, we have

So you have 11175 possible conversations.