Compute the sum 1 + \frac{1}{5} + \frac{4}{25} + \frac{8}{25} + \frac{16}{625}
1 + 1/5 + 4/25 + 8/25 + 16/625
1 + 1/5 + 12/25 + 16/625
[ 625 + 125 + 300 + 16 ] / 625 =
1066 / 625
+635 
