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.
Determine whether a vector is monotonically increasing
Summing Digits within Text
intersection of matrices
06 - Matrix Equations 3
Narcissistic number ?
Radiation Heat Transfer — View Factors (3)
Radiation Heat Transfer — View Factors (1)
Scrabble Scores - 3
Rumis Scorer 2
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