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Calculati:
a)1+3+5+...+1003
b)2+4+6+...+2n,n apartine N


Răspuns :

1+3+5+........+2n+1=n patrat
2n+1=1003
2n=1002
n=501
1+3+5+......+1003=501x501

b)
2(1+2+3+........+N)
2(N(N+1)/2)
=n(n+1)