Create a variable m as a magic square with the size 6 x 6
Magic squares are defined as square matrices, where the sum of all rows and columns are equal.
(Hint: see help magic)
Replace all the numbers above or equal to 20 with zero.
Find out total non zero element of matrix
Matlab Basics - Set unwanted parts of a vector to zero
02 - Vector Variables 2
07 - Common functions and indexing 4
07 - Common functions and indexing 1
05 - Vector Equations 2
07 - Common functions and indexing 3
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