Difference between revisions of "NCR"

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The number of ways of choosing "r" objects from "n" is written ''n''C''r''. Joyce uses small caps for N and R though by the first half of the 20th century variables were invariably written in italics.
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The number of ways of choosing ''r'' objects from ''n'' is written ''n''C''r'', and ''n'' and ''r'' are the letters usually chosen. Joyce uses small caps for N and R though by the first half of the 20th century variables were invariably written in italics.

Revision as of 09:39, 19 July 2011

The number of ways of choosing r objects from n is written nCr, and n and r are the letters usually chosen. Joyce uses small caps for N and R though by the first half of the 20th century variables were invariably written in italics.