Return x by adding a random number to it.
There is a serious disconnect between the problem statement and what is actually being tested.
Swap the first and last columns
Omit columns averages from a matrix
Check if equal
Back to basics - mean of corner elements of a matrix
Probabilities - Balls and urns - 01
Geometrical meaning of determinant
Probabilities - Balls and urns - 02
Non trivial identities - differentiation
Probabilities - More brains than luck
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