how can this be a valid solution?
Code can be made even smaller by replacing 'ans' in line 3 directly with line 2.
Omit columns averages from a matrix
Sum all integers from 1 to 2^n
Project Euler: Problem 7, Nth prime
Create a two dimensional zero matrix
Back to basics - mean of corner elements of a matrix
Breaking Out of the Matrix
Reindex a vector
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What digit is it?
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