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.
Sum of diagonal of a square matrix
Make a run-length companion vector
The Answer to Life, the Universe, and Everything
05 - Vector Equations 2
Combined Ages 1 - Symmetric, n = 3
Divisible by 8
Rule of mixtures (composites) - lower bound
Scrabble Scores - 5
Mechanical Advantage of a Gear Train
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