well, start listing them:
p = 1
n = 5
d = 10
q = 25
pp = 2
pn = 6
...
ppnnndqq = 77
Now count them up, after eliminating duplicate amounts
you have 2 pennies, 3 nickels, 1 dime and 2 quarters. how many different sums of money can you make using one or more of these 8 coins
1 answer