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.
Angle between two vectors
What number has this problem?
Mysterious digits operation (easy)
Rumis Scorer 3
Highly divisible triangular number (inspired by Project Euler 12)
Musical Note Interval 1 - Diatonic Scale
Rule of mixtures (composites) - lower and upper bounds
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