Posted by Urgen please help on Tuesday, May 29, 2012 at 8:59pm.
a)
Sum(1 odd numbers) = 1
sum(first 2 odd numbers) = 1+3=4
sum(first 3 odd numbers) = 1+3+5 = 9
mmmhhh?
they look like perfect squares
sum(first 4 odd numbers) = 1+3+5+7 = 16
appears that sum(n odd numbers) = n^2
so Sum(first 60 odd numbers) = 60^2 = 3600
test it with an arithmetic sequence method
1+3+5+7 + ... 60 = ?
a = 1, d=2, n=60
sum(60) = (60/2)(2 + 59(2)) = 3600
ok, then!!!
According to your text or course notes, what kind of reasoning did I just use?
b) sum(1200) = 1200^2 = ....
-1'
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