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comment Show ${156 \choose 87} + {156 \choose 86} = {157 \choose 87}$
Thank you for your input, but this was a problem I had on a test...
Dec
17
accepted Show ${156 \choose 87} + {156 \choose 86} = {157 \choose 87}$
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17
asked Show ${156 \choose 87} + {156 \choose 86} = {157 \choose 87}$
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accepted Combinatorics: When To Use Different Counting Techniques