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<title id="MathJax-SVG-1-Title">f left-parenthesis x semicolon r comma p right-parenthesis equals upper P left-parenthesis upper X equals x semicolon r comma p right-parenthesis equals StartBinomialOrMatrix k plus r minus 1 Choose x EndBinomialOrMatrix p Superscript r Baseline left-parenthesis 1 minus p right-parenthesis Superscript x Baseline for x equals 0 comma 1 comma 2 comma ellipsis</title>
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