Question

Qual é o 10 termo da PG(1,3,9...)

Answer 1

$PG(1,3,9,...)\\\\ a_{1} =1\\ q=3\\n=10\\ a_{n} =a_{10} =?\\\\\\ a_{n} = a_{1} * q^{n-1} \\\\\\ a_{10} = 1 * 3^{10-1}\to \\\\ a_{10} = 1 * 3^{9}\to \\\\ a_{10} = 1 * 19.683\to \\\\ a_{10} =19.683$