Thread: [SOLVED] Amounts made up using 3 of the 6 coins

How many different amounts can be made up using three of the six coins: 5 cents, 10 cents, 20 cents, 50 cents, $1, $2

i checked the answer and its 20 but the closest i've gotten to is 12

Update:dw solved

1)5c+10c+20c
2)5c+10c+50c
3)5c+10c+$1
4)5c+10c+$2
5)5c+20c+50c
6)5c+20c+$1
7)5c+20c+$2
8)5c+50c+$1
9)5c+50c+$2
10)5c+$1+$2
11)10c+20c+50c
12)10c+20c+$1
13)10c+20c+$2
14)10c+50c+$1
15)10c+50c+$2
16)10c+$1+$2
17)20c+50c+$1
18)20c+50c+$2
19)20c+$1+$2
20)50c+$1+$2