Monoface maths
Monoface is a lot of fun. It consists of photos of the staff at mono-1.com. You can change the combination of eyes, nose, mouth and head of each person for some funny outcomes.
The page claims that you can make 759,375 different faces. Where does this number come from?
I used it as an example in Principles of Counting over at the Interactive Mathematics site. You can find the answer on that page, but c’mon, try it yourself first 
Counting of combinations and permutations is known as combinatorial analysis.
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MathNerd said,
April 1, 2007 at 9:14 am
I love monoface! It’s hilarious.