How many 4-digit numbers are there with no digit repeated?
Answers
Answer:
Self respect Is The Most Important thing. If Someone doesn't respect U then Leave him/her Coz he/she is supposed to be destroy ur whole life. And The Moral is .... Leave them . If she is Ur gf then also do the Same Leave her... Be happy stay safe...(^-^)
To find four digit number (digits does not repeat)
Now we will have 4 places where 4 digits are to be put.
So, at thousand’s place = There are 9 ways as 0 cannot be at thousand’s place = 9 ways
At hundredth’s place = There are 9 digits to be filled as 1 digit is already taken = 9 ways
At ten’s place = There are now 8 digits to be filled as 2 digits are already taken = 8 ways
At unit’s place = There are 7 digits that can be filled = 7 ways
Total Number of ways to fill the four places = 9 × 9 × 8 × 7 = 4536 ways.
So a total of 4536 four digit numbers can be there with no digits repeated.