Question

Finding Combinations
Evaluate each expression
25C7

Answer 1

\[_{25}C_7=\frac{\overline{25\times 24\times 23\times 22\times 21\times 20\times 19}^{7 numbers}}{7\times 6\times 5\times 4\times 3\times 2\times 1}\]
cancel first, multiply last

Answer 2

the arithmetic is somewhat tedious, most calculators can do it for you
so can the web
http://www.wolframalpha.com/input/?i=25+choose+7

Answer 3

\[_{25} C_7=\frac{ 25! }{7!(25-7)! }\]
You can cancel most of the terms if you want to do it by hand.

Answer 4

As a matter of fact, @satellite73 has already canceled most of the factors which can be removed.

Answer 5

btw why aren't you watching the knicks?

Answer 6

I think my brother is.