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Popular Examples
13nCr 7
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13nCr\:7
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std 44,50,38,96,42,47,40,39,46,50
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std\:44,50,38,96,42,47,40,39,46,50
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20 nCr 7
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20\:nCr\:7
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9 choose 3
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9c3
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15 choose 8
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15c8
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