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.
02 - Vector Variables 2
02 - Vector Variables 4
Flip the bit
Singular Value Decomposition
Cycling — Critical Power
Tic Tac Toe Solver
Divisible by 13
Stress-Strain Properties - 7
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