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.
Back to basics 4 - Search Path
Back to basics 21 - Matrix replicating
Return the Fibonacci Sequence
Convert a vector into a number
Return area of square
02 - Vector Variables 5
07 - Common functions and indexing 6
07 - Common functions and indexing 3
06 - Matrix Equations 1
03 - Matrix Variables 1
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