If you have N things and want to find the number of combinations of R things at a time then the formula is
[(Factorial N)] / [(Factorial R) x (Factorial {N-R})]
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nCr=n!/r!/(n-r)!
It is a figure which is made up of two or more simpler shapes.
you wil have to figure it out, is it your homework?
just figure out the math problem.
dodecagon