Sigh! There should really be some quality control on Cody, to save us from stupid problems like this...
The third element of aVec in the the image contained within your problem description does not match the third element of aVec used in the test suite.
Number of 1s in the Binary Representation of a Number
Solve the set of simultaneous linear equations
Area of a disk
02 - Vector Variables 4
03 - Matrix Variables 1
03 - Matrix Variables 5
03 - Matrix Variables 2
03 - Matrix Variables 6
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