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.
Determine if a Given Number is a Triangle Number
Is it a number?
MATLAB Basic: rounding III
06 - Matrix Equations 1
07 - Common functions and indexing 6
03 - Matrix Variables 1
07 - Common functions and indexing 2
04 - Scalar Equations 3
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