Same issue here as in your third problem. Please check the absolute value of the differences of the computed values with the correct ones. Otherwise, more silly answers (again, like this one :-) will slip through!
Thanks for the catch. I've updated the test suite to check against upper and lower bounds of each answer.
Solve the Sudoku Row
We love vectorized solutions. Problem 1 : remove the row average.
Mirror Image matrix across anti-diagonal
Return area of square
Combined Ages 3 - Non-symmetric, n ≥ 3
Divisible by 13
I Plead the Fifth
Rule of mixtures (composites) - other bound
Fill-a-pix - Solution Checker
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