How many times digit 5 appears in writing natural numbers from 1 to 100

How many times the digit 7 appears in the numbers from 103 to 200?

How many times digit '5' appears in the number from 1 to 100?

How many times the digit 2 appears in the first 100 natural numbers?

How many times does the digit 8 appear in number from 1 to 100? What fraction of number up to 100 has number 8 present in them?

Find the mode of all digits used in writing the natural numbers from 1 to 100.

How many times does the digit 3 appear while writing the integers from 1 to 1000

(i) How many three - digit numbers are there, with no digit repeated ? (ii) How many four - digit numbers are there, with no digit repeated ? (iii) How many natural numbers from 1 to 1000 have none of their digits repeated ?