Ex 6.3,1 - Chapter 6 Class 11 Permutations and Combinations

Last updated at August 10, 2026 by

Ex 6.3, 1 - How many 3-digit numbers can be formed by using 1 to 9 - Ex 6.3

 

part 2 - Ex 6.3,1 - Ex 6.3 - Serial order wise - Chapter 6 Class 11 Permutations and Combinations

part 3 - Ex 6.3,1 - Ex 6.3 - Serial order wise - Chapter 6 Class 11 Permutations and Combinations

Take a fresh quiz. Then take another.
Every attempt is a new AI-adaptive Teachoo quiz with 5 questions, selected from your answers, mistakes, and progress.
Remove Ads
Teachoo · Class 11 Explore Class 11

Transcript

Ex 6.3, 1 (Method 1) How many 3-digit numbers can be formed by using the digits 1 to 9 if no digit is repeated? Let the 3-digit number be Number of 3 digit number which can be formed = 9 × 8 × 7 = 504 ways Ex 6.3, 1 (Method 2) How many 3-digit numbers can be formed by using the digits 1 to 9 if no digit is repeated? Given n = numbers from 1 to 9 = 9 r = 3 Required 3 digit numbers = 9P3 = 9!/(9 − 3)! = 9!/6! = (9 × 8 × 7 × 6!)/6! = 9 × 8 × 7 = 504

Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh is an IIT Kanpur graduate and has been teaching for 16+ years. At Teachoo, he breaks down Maths, Science and Computer Science into simple steps so students understand concepts deeply and score with confidence.

Many students prefer Teachoo Black for a smooth, ad-free learning experience.