Make the following variable:
A 9x9 matrix of zeros, but with the following values on the main diagonal:
(Hint: use diag)
Least common multiple of many numbers
Increment a number, given its digits
Return the first and last character of a string
Count up then down
03 - Matrix Variables 1
04 - Scalar Equations 1
04 - Scalar Equations 2
05 - Vector Equations 1
06 - Matrix Equations 1
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