Answer:
12 possible combinations
Explanation:
the number of ways that we could choose at least two coins is equal to the number of combinations of coins that could be given from the set of coins that we have. there are twelve possible combinations of coins that we could give from these four coins:
penny + nickel
penny + dime
penny + quarter
nickel + dime
nickel + quarter
dime + quarter
penny, nickel, dime
penny, nickel, quarter
penny, dime, quarter
nickel, dime, quarter
penny, nickel, dime, quarter