Test problem 21 is faulty.
It has been updated.
Test suite has crashed again plz fix
@ Nikolaos: are you sure it's the test suite and not a server error? If you get the following message, it is due to a temporary server problem, not a specific problem: "While evaluating the solution, the server encountered an error caused by temporary unavailability of MATLAB Service. Wait a few minutes for the MATLAB Service to return, and then rescore." If you are getting this error, simply try the problem again later or on a different day.
Number of toolboxes?
Multiply a column by a row
Side of an equilateral triangle
Lights Out 11 - 5x5, with wrapping, x moves
Self-similarity 2 - Every third term
Divisible by n, prime divisors - 11, 13, 17, & 19
Stress-Strain Properties - 1
Rule of mixtures (composites) - weighted bound
Calculator spelling - Letters to Numbers
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