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    Hey guys, I need some help with this question( attached). I tried it, but I seem to have made nearly zero progress. I was thinking it perhaps has something to do with a known theorem like AM-GM inequality but no idea. Could I please have a hint ? Link is below :

    http://i.gyazo.com/3e23ef603099db7dc9d400129b497e20.png
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    No help ?
 
 
 
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