Given four coordinates, write a function to check if they form a square on the XY plane.
Make a vector of prime numbers
07 - Common functions and indexing 1
Find the area of the four walls
Determine the length of a string of characters
Sum of a geometric series
Ratio between sum of primes and sum of factors
Ratio between sum of primer numbers and non-prime numbers
Alternating 1´s and 0´s in a matrix
Alternate list of elements
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