The use of の after a verb  by timberwillow   26. Apr 2012

Here is the example:

りんご は 何個 買った の ?
ringo ha nanko katta no?

However, I do not understand what this implies. I understand that 買った is a casual past tense verb so りんご は 何個 買った makes sense. How does の affect the meaning or emphasis of the sentence?

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