Question

a1=4 e a4=4000 qual é a razao dessa pg ?

Answer 1

$a_{1} =4\\ a_{n} = a_{4} =4.000\\n=4\\q=?\\\\\\ a_{n} = a_{1} * q^{n-1} \\\\\\ 4.000 = 4 * q^{4-1} \\\\ 4.000 = 4 * q^{3} \\\\ \frac{4.000}{4} =q^{3} \\\\ 1000=q^{3} \\\\ 2^{3} * 5^{3} =q^{3} \\\\2*5=q \\\\ q=10\\\\\\\\ (4,40,400,4.000)$