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.
Implement a ROT13 cipher
Prime factor digits
Is A the inverse of B?
length of a vector
Rule of mixtures (composites) - reverse engineering
Stress-Strain Properties - 2
Rule of mixtures (composites) - other bound
Large Sum (inspired by Project Euler 13)
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