thanks for reply!
>There are no fixed answers to this
yes,I understand it... but wonder is it wise to use adsense on pages where ECPM is 15-20 lower than on the rest of pages,
I have quite big tech tutorials section on the site, where people seem very ambitious on reading from the beginning to the end and do not click much on ads.
I did in site advertisements there - about another parts of the site, now try again to get some money from those pages..