Math+Problem+of+the+Week

=Let's tackle this __Math Mania__ and earn five points for the correct solution. Remember you must explain the steps you took to solve the problem and why do you think your approach is easy or more logical. If your explanation makes sense but your answer is not correct, you will still earn some points. The points earned in Math Mania will be part of your participation grade.=

===When two people shake hands there is one handshake between them. How many handshakes are there when three people shake hands? Four people? Five people? How many handshakes are there when 15 people shake hands?=== Feel free to type your answer on this math page.