Question

Me ajudem por favor
o número de PA de 102 termos,a razão e 8 e o 1 termo é 17.Qual o último termo?

Answer 1

Vamos lá:

A102= a1+ (n-1).r
A102= 17+ (102-1).8
A102= 17+101.8
A102= 17+808
A102= 825

S102= (A1+AN).N/2
S102= (17+S102).102/2
S102= (17+825).102/2
S102= 42942 

Abraço!!

Answer 2

an = a1 + (n – 1) . r

an = 17 + (102 - 1) . 8

an = 17 + 101 . 8

an = 118 . 8

an = 825

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