Answer:
28
Explanation:
Let us set each person as a letter:
A, B, C, D, E, F, G, H
Each person will shake hands with 7 people. However, we cannot count a handshake twice, so we need to subtract one:
A = 7
B = 6
C = 5
D = 4
E = 3
F = 2
G = 1
H = 0
Since H is equal to 0, we can take him/her out. Now, we solve:
A + B + C + D + E + F + G = 1 + 2 + 3 + 4 + 5 + 6 + 7
1 + 2 + 3 + 4 + 5 + 6 + 7 = 28
Answer: 28