Answer: 60
30
Step-by-step explanation: that’s the first two, good luck!
You must calculate how many ways can 2 people be selected from 65.
The formula is:
n! / r! * (n-r)! =
65! / 2! * 63! =
65*64*63! / 2 * 63! =
65*64 / 2 =
2,080 handshakes
Source:
http://www.1728.org/combinat.htm
Answer:a I think although I’m really tired
Step-by-step explanation:
Factors of 121 are; 1,11, and 121. so it would be D.