use Gauss's approach to find the follwoing sums (do not use formulas).
a... 1+2+3+4+...+999
b... 1+3+5+7+...+997
the sum of sequance a is...
the sum of sequance b is...

Question

anonymous · Answer

guys... I'm in precal, I don't know how to do this stuff yet

anonymous · Answer

What I find amusing about this, is that Gauss's approach actually was a formula, so I wonder why they mention not to use a formula.

anonymous · Answer

gauss approach is to add forwards and backwards

anonymous · Answer

$$S=1+2+3+4+...+997+998+999$$$$S=999+998+997+...+3+2+1$$
$$2S=1000+1000+1000+...+1000=999\times 1000$$
$$S=\frac{999\times 1000}{2}$$ at least that is the legend