Question

S=2+4+6...+106 cum se rezolvă

Answer 1

$S = 2 + 4 + 6 + ... + 106$

$S = 2(1 + 2 + 3 + ... + 53)$

$S = 2 \times \frac{53(53 + 1)}{2}$

$S = 53(53 + 1)$

$S = 53 \times 54$

$S = 2862$

$Formul \check{a}\:: \: 1 + 2 + 3 + ... + n = \frac{n(n + 1)}{2}$