[ If N is the sum of all digits used in writing all the numbers from 1 to 1000 ,then the last digit of N is ]

Find the mode of all digits used in writing the natural numbers from 1 to 1000.

The sum of all the 3 digit numbers is

Let N be the number of 4 digit numbers formed with at most two distinct digits.Then the last digit of N is

How many digits in all are required to write numbers from 1 to 124?

Let N be the number of 6-digit numbers such that the digits of each number are all form the set {1, 2, 3, 4, 5} and any digit that appears in the number appears atleast twice. Then the last digit of N is:

What is the sum of all three digit numbers formed by using the digits 1,2,3,?

The sum of the digits in unit place of all the numbers formed using the digits 3,4,5,6 without repetitions, the no. of such numbers are

Sum of digit in the sum of all integers from 1 to 1000 inclusive which contain at least one 7 in their digits i.e.7+17++979+987+997= N.