Find the sum of interior angles for polygon of x sides.
The correct answer is not really defined for x = 1, that is a one-sided polygon.
The test cases are insufficient.
Make the vector [1 2 3 4 5 6 7 8 9 10]
Select every other element of a vector
Who knows the last digit of pi?
Return 'on' or 'off'
prime test 2
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