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.
Remove the air bubbles
Sum of diagonal of a square matrix
Find the maximum two numbers of every column of a matrix
Max of a Vector
Compute LOG(1+X) in natural log
Divisible by 3
Divisible by n, prime vs. composite divisors
Divisible by 13
Divisible by 14
Is it really a 5?
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