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S=1+2...49+50 va rog ajutatima

Răspuns :

S=1+2+3+..+50 =》S=50×51÷2=》S=25×51=》S=1275
S=50*51:2
S=25*51
S=1275
Aceasta e regula sumei gaus
S=1+2+3+.....+n=n*(n+1):2