document.write( "Question 732503: how many ways can you choose 2 stamps out of 7
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Algebra.Com's Answer #447869 by MathLover1(20850)\"\" \"About 
You can put this solution on YOUR website!
here you need to use combinations, the items do not have to be in any particular order, just rearrange them in the same sequence\r
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\n" ); document.write( "\n" ); document.write( "\"nCr=n%21%2F%28n-r%29%21r%21\"\r
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\n" ); document.write( "\n" ); document.write( "\"7C2=7%21%2F%287-2%29%212%21\"\r
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\n" ); document.write( "\n" ); document.write( "\"7C2=7%21%2F%285%212%21%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"7C2=5040%2F%28120%2A2%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"7C2=5040%2F240\"\r
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\n" ); document.write( "\n" ); document.write( "\"7C2=21\"\r
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