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.
Roll the Dice!
We love vectorized solutions. Problem 1 : remove the row average.
Reverse the elements of an array
Try 1.5.4: Celsius to Fahrenheit
Calculate area of sector
Scrabble Scores - 9
Divisible by n, prime vs. composite divisors
Divisible by 2
Equation Times (of the day)
Self-similarity 3 - Every other pair of terms
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