Question

1) Escreva a soma dos primeiros 6 termos (2,5,8...)

Answer 1

Resposta:

r=a2-01

r=5-2

r=3

a6=a1+5r

a6=2+5*3

a6=2+15

a6=17

SN=(a1+an)n/2

SN=(2+17)6/2

SN=19*3

SN=57

Answer 2

Resposta:

a1= 2

r= 3

Termo geral

a6= 2+(6-1).3

a6= 17

Sn= (a1+an).n/2

S6= (2+17).6/2

S6= 57

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