Question 1161153
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You didn't say repetition is not allowed, so I'll assume that it is.


There are five ways to choose the first digit, five ways to choose the second digit, and four ways to choose the last digit because the last digit cannot be 5.  So:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 5\,\times\,5\,\times\,4]
								
								
John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
<img src="http://c0rk.blogs.com/gr0undzer0/darwin-fish.jpg">
*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \  
								
{{n}\choose{r}}
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