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 any row in which a NaN appears
give nth decimal place of pi
Back to basics 4 - Search Path
Replace multiples of 5 with NaN
Dice roll - opposite faces
Stress-Strain Properties - 7
Lights Out 7 - 5x5, x moves
Divisible by n, Truncated-number Divisors
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