Question

qual e o 15 termo da PG(1,2,4...)

Answer 1

$PG(1,2,4...)\\\\ a_{1} =1\\ q=2\\n=15\\ a_{n} =a_{15} =?\\\\\\ a_{n} = a_{1} * q^{n-1} \\\\\\ a_{15} = 1 * 2^{15-1}\to \\\\ a_{15} = 1 * 2^{14}\to \\\\ a_{15} = 1 * 16.384\to \\\\ a_{15} = 16.384$