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How do you find the formula for triangular numbers?

Forums: Science And Math
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jcroucher
 
Reply Sun 21 Jan, 2007 10:56 am
How do i find the formula for triangle number..
..1, 3, 6, 10, 15..
And how do you do it?!? I'm so stuck with this..
Can anyone help me??
x
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Type: Discussion • Score: 1 • Views: 460 • Replies: 2
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markr
 
  1  
Reply Sun 21 Jan, 2007 01:30 pm
Look at it geometrically and you'll notice a pattern for generating triangular numbers. Once you see the pattern, recall a formula you've likely learned that computes such series.
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Brandon9000
 
  1  
Reply Sun 21 Jan, 2007 01:33 pm
The formula for the nth triangle number is (n^2 +n)/2.
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