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.
Project Euler: Problem 3, Largest prime factor
Return elements unique to either input
Angle between Two Vectors
Who is the smartest MATLAB programmer?
Lights Out 15 - 5x5, broken buttons I
Lights Out 10 - 5x5, with wrapping, 6 moves
Rule of mixtures (composites) - other bound
Rule of mixtures (composites) - lower bound
5 Prime Numbers
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