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S=2+4+6+8.....+2002 calculati S cu suma gaus

Răspuns :

S=2+4+6+8.....+2002 = 2 x(1+2+3+...+1001)= 2*1001*1002/2=1 003 002

S=2*(1+2+3+...+2002)=

  =2* (1001*1002):2 = 1001*1002 =1 003 002