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Calculați s=15+16+17+....99

Răspuns :

s=(85×114)÷2
s=85×57=4845
Gauss 1+2+..+n=n(n+1)
S=1+2+3+..+99-(1+2+3+...+14)
S=99*100:2-14*15:2
S=4950-105
S=4845