Răspuns :
Răspuns:
[tex]1 + 3 + 5 + 6 + ... + 69 = 69 \times \frac{(69 + 1)}{2} = 69 \times \frac{70}{ 2} = 69 \times 35 = 2415[/tex]
Răspuns:
[tex]1 + 3 + 5 + 6 + ... + 69 = 69 \times \frac{(69 + 1)}{2} = 69 \times \frac{70}{ 2} = 69 \times 35 = 2415[/tex]