[" 16.What is the sum of the "100" terms of the series "],[9+99+999+...?],[[" (a) "(10)/(9)(10^(100)-1)-100," (b) "(10)/(9)(10^(99)-1)-100],[" (c) "100(100^(10)-1)," (d) "(9)/(100)(10^(100)-1)]]