Add command for permuations and combinations
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\newcommand{\N}{\mathbb{N}}
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\newcommand{\N}{\mathbb{N}}
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\newcommand{\Z}{\mathbb{Z}}
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\newcommand{\Z}{\mathbb{Z}}
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\newcommand{\nCr}[2]{\,_{#1}C_{#2}}
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\newcommand{\nPr}[2]{\,_{#1}P_{#2}}
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