This one should work for all of the test cases except that you have some numerical precision issues with the last test case. Please replace it with a numerical comparison that takes into account precision (my code is returning numbers with no decimal point but the test code returns something less pretty).
Which doors are open?
Figurate number triangle
Find the sum of the elements in the "second" diagonal
Determine if input is a Narcissistic number
find radius of cone
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