1) Everyone at the party shook hands with everyone else exactly once. If there were a total of 21 handshakes, how many people were at the party?

2) Kathy tossed a coin 8 times and got 3 heads and 5 tails. How many different sequences of results could she have gotten?

Thanks! These are a couple problems that have stumped me and need some help on :)

Guest May 4, 2019