Student or Learner
Please correct me if i understood it wrong.
Numbers are usually written in singular. I.E. two hundred Euro, not two hundreds Euro; two set of drawing not two sets of drawing.
The plural is only used with dozen, hundred, thousand, million, billion, if they are not modified by another number expression.
I.E. hundreds of Euros; thousand of light years.
Thanks in advance
'Set' is not a number. Two sets of drawings.