1*2*3*.......*50
Avem : 2*5*10*12*15*20*22*25*30*32*35*40*42*45*50=
= (2*5)*10*(12*15)*20*(22*25)*30*(32*35)*40*(42*45)*50=
= (10*10)*(180*20)*(550*30)*(1120*40)*(1890*50)=(100*3600)* *(16500*44800)* 94500= 360000* (739200000*94500)=
11 zerouri + 1(ultima paranteza are un 2 * 5) =12 zerouri
