Question

Calcule a soma dos seis primeiros termos da PG (2,10,50,...)

Answer 1

$S_{6}= \frac{ a_{1} ( q^{n}-1) }{q-1} \\ \\ S_{6} = \frac{2( 5^{6}-1) }{4} \\ \\ S_{6}= 2.15625/4 \\ \\ S_{6}= \frac{31250}{4} \\ \\ S_{6} = 7812,50$a1 = 2
q = 5