Question

You have four coins
1 ¢
5 ¢
10 ¢
25 ¢
How many different sums of money can you select?
Use set notation to list all the options you have.
How many options will there be if you have to use at least one coin in each of them?

Answer 1

Empty Set
0

One Coin
1
5
10
25

Two Coins
1 5
1 10
1 25
5 10
5 25
10 25

Three coins
1 5 10
1 5 25
1 10 25
5 10 25

Four Coins
1 5 10 25

Done. I left the proper formatting to you.