Question

Qual é o vigésimo termo da P.A (3,8,...)

Answer 1

an=a1+(n-1). K
a20= 98

Answer 2

$a_n=a_1+(n-1)\cdot r$

$a_{20}=3+(20-1)\cdot5$

$a_{20}=3+19\cdot5$

$a_{20}=3+95$

$\boxed{\boxed{a_{20}=98}}$