area of a polygon is p*a/2.
where, p is the perimeter and
a is the apothem i.e. the normal distance from center to any of the sides of the polygon.
Solve the set of simultaneous linear equations
Getting the indices from a vector
Replace odd number in given matrix by zero
Sum all integers from 1 to 2^x
Game of life - 01
Ugly numbers - 03
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