Question

at a party, everyone shook hands with everybody else. there were 66 handshakes. How many people shook hands?

Answer 1

12

Explanation:

0 + 1 + 2 + 3+ 4 + 5 + 6 + 7 +8 + 9 + 10 + 11 seems to equal 66. That means there are 11 + 1 = 12 people (don’t forget to count the person who shakes 0 hands)