Klinefelter syndrome is an consequence of what type of mutation

The Klinefelter syndrome is a consequence of non-disjunction mutation. It is simply understood as having an extra X chromosome for males. The Klinefelter syndrome can be a result during cell divisions either of meiotic or mitotic cell divisions. There is an imbalance of the division of cell and this resulting to Klinefelter syndrome. When a male was born, it usually has one X and one Y chromosome but in this case, a male can have one or more X chromosome. This syndrome common leads for the males having unusual physical attributes. 

This is what i did 45-5=4040÷4=10so there are 10 white marbles but am not sure is just a question that am not sure