# SOLUTION: A girl has 7 coins of different denominations. How many different sums of money can she form using 2 coins at a time?

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 Question 634835: A girl has 7 coins of different denominations. How many different sums of money can she form using 2 coins at a time?Found 2 solutions by ewatrrr, richwmiller:Answer by ewatrrr(10682)   (Show Source): You can put this solution on YOUR website! ``` Hi A girl has 7 coins of different denominations. How many different sums of money can she form using 2 coins at a time? 7C2 = ways ```Answer by richwmiller(9135)   (Show Source): You can put this solution on YOUR website!the first coin can be any of 7 the second coin can be any of 6 7*6=42 sums assuming none can be duplicated.