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.
given 3 sides, find area of this triangle
Getting logical indexes
Are all the three given point in the same line?
Sum the Digits of a Number
Matlab Basics II - squares
Rule of mixtures (composites) - weighted bound
Dice roll - lateral faces
Rule of mixtures (composites) - either bound
Tic Tac Toe Solver
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