[tex]D_{180}=\{1,2,3,\boxed{4},5,6,9,10,\boxed{12},15,18,\boxed{20},30,\boxed{36},45,\boxed{60},90,\boxed{180}\} \\
Ti-am~bagat~in~chenare~multiplii~de~4. \\ \\
5~elevi; \\
Daca~isi~corecteaza~unul~altuia~in~afara~de~lucrarile~proprii: \\ \
5*5-5=25-5=\boxed{20}(moduri~de~a~distribui~lucrarile) \\ \\
La~prima~intrebare:NU~STIU,SCUMPA~:))`[/tex]