Question

O DECIMO QUINTO TERMO DA SEQUENCIA DE FRAÇOES ( 1/2,2/3,4/4,8/5,16/6....) VALE: A)2048 B)1024 C)832 D)768 e)512

Answer 1

$a_n=\frac{2^{n-1}}{n+1}\\ \\ a_{15}=\frac{2^{14}}{16}=\frac{16384}{16}=1024$