R help - Mar 2016 - Rfacebook -- searchPages() -- help

Hi,
I?m using searchPages() function in ?Rfacebook' package. 

I want to know why I receive 400 pages when i command only 300 pages in the
function.
sample code: 
searchPages(?youtube?, n=300, token=fb_oauth)
output printed: 200 pages 400 

Also, the result differs whenever I specify n>200 in the function.

Regards,
Sunny Singha
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