Solution:
Using the “Problem Solving Process.
”The Handshake Problem #1”

1. Understand the problem
1. What data or information is known?

20 people
Shake hands with everyone.
N= #people

1. What data or information is unknown?

How many hands will I shake if 20 people in the room.

1. What are the conditions?

n>0

2. Make a Plan to solve the problem – (This is known as an Algorithm!)

   n-1=Hands Shaken

3. Carry out the plan.

   20-1=19

4. Reflect on how the problem was solved.

   It should work with all group sizes