Thursday

March 26, 2015

March 26, 2015

Posted by **Renee** on Sunday, November 7, 2010 at 10:06am.

- Math -
**Reiny**, Sunday, November 7, 2010 at 10:11amFor n people the number of handshakes would be

C(n,2)

so

n!/(2!(n-2)!) = 55 , where n is a positive integer.

n(n-1)/2 = 55

n(n-1) = 110

n^2 - n - 110 = 0

(n-11)(n+10) = 0

n = 11

**Answer this Question**

**Related Questions**

Math - At a party, 55 handshakes took place as everyone shook hands with ...

math - At a party everyone shook hands with everyone exactly once there were a ...

Algebra - A scientist wants to research the potential spread of germs by contact...

math - How many people were at a party if There were 105 handshakes at a party ...

math - At a party, there were 105 handshakes. If each person shook hands exactly...

maths - Dear Sir I need help for the below questions Please help thanks larry ...

7th grade - At a party, there were 105 handshakes. If each person shook hands ...

Math - Sr. John and his wife went to a party where four other married couples ...

math - taylor was having a party.she invited 20 friends to her party, if each ...

math - At the faculty costume party, each teacher from Transylvania Middle ...