document.write( "Question 1065679: Theorem 1.11 states that: (𝑛 choose 𝑟) = (𝑛 − 1 choose 𝑟) + (𝑛 − 1 choose 𝑟 − 1). Use factorials to prove this theorem. \n" ); document.write( "

Algebra.Com's Answer #681133 by ikleyn(52781) $\"\"$ $\"About$

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\n" ); document.write( "See the lesson \r
\n" ); document.write( "\n" ); document.write( " - Binomial Theorem, Binomial Formula, Binomial Coefficients and Binomial Expansion\r
\n" ); document.write( "\n" ); document.write( "in this site.\r
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\n" ); document.write( "\n" ); document.write( "Same identity, slightly different designation for indexes.\r
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\n" ); document.write( "\n" ); document.write( "Also, you have this free of charge online textbook in ALGEBRA-II in this site\r
\n" ); document.write( "\n" ); document.write( " - ALGEBRA-II - YOUR ONLINE TEXTBOOK.\r
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\n" ); document.write( "\n" ); document.write( "The referred lesson is the part of this textbook under the topic
\n" ); document.write( "\"Binomial expansion, binomial coefficients, Pascal's triangle\".\r
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