Question

There are 10 people in a room. If each person shakes hands with exactly 3 other people, what is the total number of handshakes?

Answer 1

people: 10
one person : 3 people hand shake
then ( 10 × 3 ) - 10
answer : 20

Answer 2

Answer:

15

Step-by-step explanation:

Each person shakes hands with exactly 3 other people

So, we have 10 people and each experiences 3 handshakes for a total of 30 handshakes.

it is important to note that every handshake has been counted TWICE. For example, if Person X and Person Y shake hands, then Person X counts it as a handshake, and Person Y also counts it as a handshake. But only one handshake occurred.

To get the answer just divide 30 by 2 to get 15