Resolução!
[tex]p = a1 {}^{n} . \: q \frac{n(n - 1)}{2} \\ 1 = 64 {}^{7} . \: q \frac{7(7 - 1)}{2} \\ 1 = 64 {}^{7} . \: q \frac{7.6}{2} \\ 1 = 64 {}^{7} . \: q \frac{42}{2} \\ 1 = 64 {}^{7} .q {}^{21} \\ 1 = 4398046511104 \: .q {}^{21} \\ \frac{1}{4398046511104} = q {}^{21} \\ ( \frac{1}{4} ) {}^{21} = q {}^{21} \\ q = \frac{1}{4} \\ \\ \\ resposta > b \\ \\ \\ espero \: ter \: ajudado[/tex]
