Question

Calcule o vigésimo termo da PA (2,7/3,...)

Answer 1

Resposta:

a1 = 2     r = 7/3 - 2 = 7 - 6 = 1

an = a1 + (n-1). r

a20 = 2 + (20-1). 1

a20 = 2 + 19

A20 = 21

Answer 2

r=7/3-2=1/3

an=a1+(n-1).r

a20=2+(20-1).1/3

a20=3+19/3

a20=28/3