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.
Check if sorted
Return the Fibonacci Sequence
Area of an Isoceles Triangle
Rule of mixtures (composites) - lower bound
Lights Out 2 - 5x5, 4 moves
Word Distance - Average Sort
Divisible by 5
Divisible by 14
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