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 NaN ?
Flag largest magnitude swings as they occur
Create a two dimensional zero matrix
Back to basics - mean of corner elements of a matrix
Lights Out 2 - 5x5, 4 moves
Scrabble Scores - 13
Divisible by n, prime divisors - 11, 13, 17, & 19
Not square-free number sequence
Stress-Strain Properties - 3
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