[tex]S7 = \frac{b1*(q^{7}-1) }{q-1} = \frac{8*(4^{7}-1) }{4-1} =43688[/tex]
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[tex]S7 = \frac{b1*(q^{7}-1) }{q-1} = \frac{8*(4^{7}-1) }{4-1} =43688[/tex]