[tex]\displaystyle\bf\\"trei puncte"=~\vdots~~si~inseamna~"divizibil".\\\\\textbf{Consider ca se cere sa aratam ca suma}\\ \textbf{din enunt este divizibila cu 6.}\\\\6~\vdots~(1+2+3+4+...+24)~este~gresit\\\\Corect~este:~~~(1+2+3+4+...+24)~\vdots~6\\\\sau\\\\6~\Big|~(1+2+3+4+...+24)~este~corect.\\\\unde~semnul~\Big|~inseamna~divide.\\\\Rezolvare:\\\\1+2+3+4+...+24=\frac{24(24+1)}{2}=\\\\=\frac{24\times25}{2}=12\times25=6\times2\times25=(6\times50)~\vdots~6[/tex]
