How many cards do one need to build a house of cards with n stages?
/\ 2 cards for 1 stage
/_\ 7 cards for 2 stages
@Thomas, the Test Suite is broken. Please provide "x" or replace it with "n" in tests.
Sorry for mistake! You are right! thanks
Who Has the Most Change?
Replace NaNs with the number that appears to its left in the row.
Replace multiples of 5 with NaN
Largest Prime Number
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