Question

Calcular a soma dos 90 primeiros numeros impares​

Answer 1

resolução!

an = a1 + ( n - 1 ) r

an = 1 + ( 90 - 1 ) 2

an = 1 + 89 * 2

an = 1 + 178

an = 179

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Sn = ( a1 + an ) n / 2

Sn = ( 1 + 179 ) 90 / 2

Sn = 180 * 90 / 2

Sn = 16200 / 2

Sn = 8100