n!
Use:
n 'k k!(n-k)!
to solve the combination.
After a band parent meeting, each of
the ten members shook hands with
each other once. How many
handshakes were there in all?
Hint: Remember that one handshake involves
two people.
[?] handshakes

n Use n k knk to solve the combination After a band parent meeting each of the ten members shook hands with each other once How many handshakes were there in al class=