Dr Pooranmal and Ashfaq A Khan Solutions for Chapter: Natural Numbers and Whole Numbers, Exercise 1: EXERCISE 2.1

How many numbers in all are there with three digits?

How many numbers in all are there with five digits?

How many numbers in all are there with seven digits?

How many different $4$-digit numbers can be formed using the digits $0, 2, 4, 6$ without repeating any digit in the number?

How many $3-$digit numbers can be made using the digits $1, 2, 3, 4, 5, 6, 7, 8 \mathrm{and} 9$, if the repetition of the digits is not allowed? Write down the smallest and the greatest of these numbers.

Write the largest and smallest $5-$digit numbers using each of digits $3, 4, 0, 5, 2$ only once. Find their difference.

Write the smallest $4-$digit number which remain same on reversing the order.

Rearrange the digits of $10804235$ to get the smallest number of $8$ digit and greatest number of $8$ digits. Hence, find the difference.