Combination 1: 3 quarters (25 cent).
Combination 2: 2 quarters and 5 nickels.
Combination 3: 2 quarters, 2 dimes, 1 nickel.
Combination 4: 15 nickels
Combination 5: 7 dimes and 1 nickel.
Combination 6: 1 quarter, 5 dimes
Combination 7: 1 quarter, 1 dime, 7 nickels.
Combination 8: 1 quarter, 2 dimes, 6 nickels.
Combination 9: 1 quarter, 3 dimes, 4 nickels.
Combination 10: 1 quarter, 4 dimes, 2 nickels.
I believe those are all the possible combinations.
I hope that helped you! :)