31 ways. Here's why: You can either use no quarter, or 1 quarter. Case 1: you don't use a quarter. 1. If you don't use any dimes, then you can use from 0 through 8 nickels and the rest pennies. That's 9 ways. 2. If you use exactly 1 dime, you can use from 0 through 6 nickels and the rest pennies. That's 7 ways. 3. If you use exactly 2 dimes, you can use from 0 through 4 nickels and the rest pennies. That's 5 ways. 4. If you use exactly 3 dimes, you can use from 0 through 2 nickels and the rest pennies. That's 3 ways 5. If you use exactly 4 dimes, you must use just 1 penny. That's 1 way. For case 1, where there are no quarters. there are 9+7+5+3+1 or 25 ways. ------- Case 2: you use 1 quarter. Now the problem is to make the remaining 16 cents using dimes, nickels and pennies. You can either use no dime or 1 dime. 1. If you don't use a dime, you can use from 0 through 3 nickels and the rest pennies. That's 4 ways. 2. If you use exactly 1 dime, you can use no nickel or 1 nickel. and the rest pennies. That's 2 ways. For case 2, where there is 1 quarter. there are 4+2 or 6 ways to make the remaining 16 cents. ---------------- Final answer: 25+6 or 31 ways. Edwin