I think the description may be more appropriate to say the 'sum of all the numbers in the triangle'.
Omit columns averages from a matrix
Volume of a sphere given its surface area
Given a matrix, swap the 2nd & 3rd columns
MATLAB Basic: rounding
Number Puzzles - 004
Number Puzzle - 051
Number Puzzle - 039
Find the Pattern 3
Find the Pattern 4
Matrix Pattern 5
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