SOLUTION: What is the last element in the 20th row 1 2 3 4 5 6 7 8 9 10

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Question 656241: What is the last element in the 20th row
1
2 3
4 5 6
7 8 9 10
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Hint: The last number in each row is part of the Triangular Number Sequence.