Resposta :
q=12/3 → q=4
[tex] S_{6} [/tex]=a1(q^6-1)/q-1
[tex] S_{6} [/tex]=3(4^6-1)/6-1
[tex] S_{6} [/tex]=3(4096-1)/5
[tex] S_{6} [/tex]=3(4095)/5
[tex] S_{6} [/tex]=12285/5
[tex] S_{6} [/tex]=2457
[tex] S_{6} [/tex]=a1(q^6-1)/q-1
[tex] S_{6} [/tex]=3(4^6-1)/6-1
[tex] S_{6} [/tex]=3(4096-1)/5
[tex] S_{6} [/tex]=3(4095)/5
[tex] S_{6} [/tex]=12285/5
[tex] S_{6} [/tex]=2457