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.
Swap two numbers
Is this triangle right-angled?
Radiation Heat Transfer — View Factors (3)
Divisible by 12
Divisible by n, prime vs. composite divisors
Rumis Scorer 1
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