Return x by differentiating it.
I'm confused by this problem. It requires the use of diff() and asks for differentiation, but it tests for equality with the input variable...
the author had proposed lots of questions with meaningless test. i despise this behavior
Probabilities - More brains than luck
Probabilities - Balls and urns - 01
A shooting competition
Performance - summation
Probabilities - Balls and urns - 02
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