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## anonymous 3 years ago Sigma Notation Question!!!!

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1. anonymous

Question 5b please!!

2. anonymous

What's the easy way of doing it?

3. anonymous

I think the answer is three?

4. anonymous

yep

5. anonymous

Yaay

6. anonymous

there's problem a general expression for the sum, don't know what exactly it is, but it's easy enough to see... $(\sqrt[4]{1+1} -\sqrt[4]{1}) +(\sqrt[4]{1+2} -\sqrt[4]{2}) + (\sqrt[4]{1+3} -\sqrt[4]{3})...$ 1st and 4th terms cancel, 3rd and 6th terms cancel... etc. all terms cancel but the second and last

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