I think the description may be more appropriate to say the 'sum of all the numbers in the triangle'.
Problem statement updated.
Back to basics 14 - Keywords
Return unique values without sorting
Vectors counting by 2
Replace every 3rd element in a vector with 4
Number Puzzle - 044
Find the Pattern 9
Number Puzzle - 048
Number Puzzle - 089
Splitting Square - Problem the third
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