numbers -- JMO std. V and VI

 Find the total number of digits in the number
123456789101112..........20102011

JMO STD V and STD VI

Answer:

1 to 9 ---------- 9 digits

10 to 99 -------- (90 x 2) digits = 180 digits

100 to 999 ------- (900 x 3) digits = 2700 digits

1000 to 2011 ----- [(2011 - 1000 + 1) x 4] digits = 4048 digits

total number of digits = 6937 digits