The book College Algebra was written by author Leonard E Leonard Eugene Dickson Here you can read free online of College Algebra book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is College Algebra a good or bad book?
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. The proposition also follows from the formula for, (7^.. Thus ri '_:_: : _ "• _ p " -^' - (;, _ r) ! [;/ - {n - r)] ! {n - r) ! r\ ~ "" '" n^n 89. Theorem. For positive integers n mid- r, The combinations of n + 1 different letters a^^ a^, • • • ? «w> ^^i + i ^' ^t a time may be separated into two sets, according as the combination contains the last letter c„ A. A A. A. A A. , 0, A, Ao fi. A A, 88 PERMUTATIONS AND COMBINATIONS. [Ch. IX the n letters «j, a^, ,, . , a^^ which can be done in nCr...-i ways. If the last letter be not taken, we must select r letters from the n letters «j, rt^, . . . , a„, which can be done in ^0^ ways.
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