SOLUTION: The sum of the first n odd numbers is 3600. What is the last odd number to be added when the numbers are arranged in natural order?

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Question 323636: The sum of the first n odd numbers is 3600. What is the last odd number to be added when the numbers are arranged in natural order?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
S=%28n%28A1%2BAn%29%2F2%29=3600
n%281%2BAn%29=7200
.
.
.
An=A1%2B%28n-1%29%2A2
An=1%2B2n-2
An=2n-1
Substituting,
n%281%2B2n-1%29=7200
2n%5E2=7200
n%5E2=3600
n=60
A%2860%29=2%2860%29-1=119