Check whether the input matrix is a figurate number triangle: http://mathworld.wolfram.com/FigurateNumberTriangle.html
you should probably add a test case where the correct answer is false.
I added a few more tests as suggested.
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Angle between Two Vectors
Make a random, non-repeating vector.
Sum the entries of each column of a matrix which satisfy a logical condition.
02 - Vector Variables 3
Sum my indices
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