Prove 1<a<2 ? Please help

Hey Forum!
So i stumbled upon this question and im having difficulty proving it. =/
Any help would be appricited.

Attachment 18182

n/{1/a+1/b}<=sqrt{ab}<={a+b}/2

Quote:

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Originally Posted by Also sprach Zarathustra

n/{1/a+1/b}<=sqrt{ab}<={a+b}/2

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Im confused... how does that prove it?

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Originally Posted by jess0517

Hey Forum!
So i stumbled upon this question and im having difficulty proving it. =/
Any help would be appricited.

Attachment 18182

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Try inducting on for both inequalities.

Thread closed due to this member deleting questions after getting help.