Suma Gauss ........

Răspuns:
a)100-1+1=100
b)2*(1,2,3,...,50)=2*(50-1+1)=2*50=>50-nr de termeni
c)50 termeni
d)85-37+1=48+1=49
e)2*(21,22,23,...,66)=2*(66-21+1)÷2*46=>46-nr de termeni