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.
Find the peak 3n+1 sequence value
07 - Common functions and indexing 5
Replace Nonzero Numbers with 1
Matlab Basics II - Minimum
Radiation Heat Transfer — View Factors (5)
Divisible by n, Composite Divisors
Divisible by n, prime divisors from 20 to 200
Tic Tac Toe Solver
Divisible by 15
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