The number of handshakes that will occur in a group of eighteen people if each person shakes hands once with each other person in the group is 153 handshakes
In order to determine the number of handshakes that will occur among 18 people, that is, the number of ways we can choose 2 persons from 18 people.
∴ The number of handshakes = 






∴ The number of handshakes = 153 handshakes
Hence. 153 handshakes will occur in a group of eighteen people if each person shakes hands once with each other person in the group.
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An hour is 60 minutes so 80-60 = 20 so 1 hour and 20 minutes.
I am sure it's One Solution
Answer:
c
Step-by-step explanation:
as the roots are imaginary so it does not intersect x-axis.
C