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.
Angle between Two Vectors
Return fibonacci sequence do not use loop and condition
Sums of Multiple Pairs of Triangular Numbers
Combined Ages 1 - Symmetric, n = 3
Stress-Strain Properties - 5
Divisible by 9
Divisible by 6
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