Question

Determinati (S1 ; S2) in urmatoarele cazuri:-S1=1+2+3+...+32 si S2=1+2+3+...+39

Answer 1

S1=1+2+3+...+32
S=[n×(n+1)]:2
S1=(32×33):2=
S1=528

S2=1+2+3+...+39
S2=(39×40):2=780

Answer 2

32×(32+1):2=33×16=528.....39×(39+1):2=39×20=780 gauss