Question

determine o valor da soma s=2+5+8...+200.​

Answer 1

Resposta:

S = 6767

Explicação passo-a-passo:

an = a1 + (n-1)r

200 = 2 + (n - 1 ).3

200 = 2 + 3n - 3

200 = 3n -1

3n = 200 + 1

3n = 201

n = 201/3

n = 67

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$Sn=\frac{(a1+an)n}{2} \\\\Sn=\frac{(2+200).67}{2} \\\\Sn=\frac{202.67}{2} \\\\sn=101.67\\\\Sn=6767$