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Razvad, Alitta, Renataboukoom, cineva care stie va rog

Razvad Alitta Renataboukoom Cineva Care Stie Va Rog class=

Răspuns :

A= (6-1)/(1×6)+(11-6)/(6×11)+(16-11)/(11×16)+...+(206-201)/(201×206)
A=1-1/6+1/6-1/11+1/11-1/16+...+1/201-1/206
A=1-1/206
A=205/206