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Calculati suma 1+3+5+7+......+97+99

Răspuns :

Folosim formula: [tex]1+3+5+7+...+n = (\frac{n+1}{2})^{2} [/tex]

[tex]1+3+5+7...+97+99 = (\frac{99+1}{2})^{2} = (\frac{100}{2})^{2} = 50^{2} = 2500 [/tex]