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
Number of Horns on a unicorn!
Generate this matrix
multiply by three
Matrix of almost all zeros, except for main diagonal
Probabilities - Balls and urns - 02
Non trivial identities - reshape
Probabilities - Balls and urns - 01
Non trivial identities - flipping
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