[tex] > resolucao \\ \\ \geqslant progressao \: geometrica \\ \\ an = 375 \\ q = 5 \\ n = 4 \\ \\ \\ an = a1 \times q {}^{n - 1} \\ 375 = a1 \times 5 {}^{4 - 1} \\ 375 = a1 \times 5 {}^{3} \\ 375 = a1 \times 125 \\ a1 = \frac{375}{125} \\ a1 = 3 \\ \\ \\ > < > < > < > < > < > < > < > > [/tex]
