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Using the following bills: $1, $5, $10, $20, $50--How many

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Using the following bills: $1, $5, $10, $20, $50--How many [#permalink] New post 08 Nov 2005, 19:18
Using the following bills: $1, $5, $10, $20, $50--How many unique sums can be formed using any number of these bills only once?

20
24
31
75
120
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 [#permalink] New post 08 Nov 2005, 19:23
total combination :( 5c0+5c1+5c2+5c3+5c4+5c5) =32.
From this subract 5c0 which is none selected.
So, 31.
  [#permalink] 08 Nov 2005, 19:23
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Using the following bills: $1, $5, $10, $20, $50--How many

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