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Standard Set Controller for parent to child query

I am creating a parent record and attaching images to it.


On the same page I am showing the parent record with the number of images attached to it.


When I set page size of standard set controller as 5 then for first record it shows me count of attachments as 4 even though it is more than that.


But when I set page size as 10, it shows me count 9.


This problem exists only when I have single record of parent object and disappears when I create one more record.


So does anyone know how the setpagesize() method of standard set controller works  for the child records.


Please help asap.


Thank you.