Make fMat be a 5x3 matrix of random integers with values from -3 to 3
(Hint: use randi)
Test for randomness could be tightened (cf. Solution 1490988).
Which doors are open?
Check if sorted
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Project Euler: Problem 10, Sum of Primes
BASICS - sum part of vector
03 - Matrix Variables 3
02 - Vector Variables 1
03 - Matrix Variables 2
07 - Common functions and indexing 2
07 - Common functions and indexing 6
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