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.
Find the sum of the elements in the "second" diagonal
Volume of a Parallelepiped
Find a subset that divides the vector into equal halves
Sum of odd numbers in a matrix
Large Sum (inspired by Project Euler 13)
Rule of mixtures (composites) - reverse engineering
Radiation Heat Transfer — View Factors (1)
Fill-a-pix - Solution Checker
Divisible by 8
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