7 x 4 t 1
you can make 40 cents withiut using pennies 7 ways
9
29
Inifinitely many ways, for example: 101 - 1, 102 - 2, 103 - 3, etc. Note that in each case, no number was used more than once.
10
you can make 40 cents withiut using pennies 7 ways
9
4 Possible ways
29
24 42
From my calculations, there's only 293 ways to make change for a dollar.
29
dimes nickels.
Inifinitely many ways, for example: 101 - 1, 102 - 2, 103 - 3, etc. Note that in each case, no number was used more than once.
1
10
55-1 53+1