Count the number of primes less than 'n'.
Nice test cases!
With a more robust Test Suite many/most of the submissions would fail for ignoring the Problem Statement instruction that primes must be less than n. Please add test cases in which the input x (or "n") is itself a prime.
Sort a list of complex numbers based on far they are from the origin.
Is the Point in a Circle?
MATCH THE STRINGS (2 CHAR) very easy
Area of a Square
Linear system of equations
Display negative numbers
Roots of a quadratic equation.
Create a constant offset.
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