Question

How many four
digit numbers can be formed with
the 0, 2, 3, 5, 7 such that no digitu are repeated?​

Answer 1

Step-by-step explanation:

How many four digit numbers can be formed using

4 Answers

First of all we need to determine whether digits can be repeated or not. So I will solve the questions using both scenarios.

Digits can be repeated :

Let us assume the four digit number is in the form of four blank spaces to be filled, like this

__ __ __ __

Now we can fill any of the four digitsin the first blank.

Once it is filled, we can again fill the other one with any of the four digits since numbers CAN be reapeated.

Consequently, all blanks can be filled with 4 digits.

How many four digit numbers can be formed using the digits 1, 2, 3, and 5 if repetition is allowed?

How many 4-digit numbers can be formed using the numbers 2, 5, 6 and 9 without repeating

How many four-digit numbers are formed using the digits 7, 8, 3 and 5?

How many 4 digits can be formed by

How many 3 digit numbers can be formed using the digits 1, 2, 3, 4, 5 without repeating a

Other Answers

If we consider 2,3,5,7 the possible pairs with these numbers are if repititon is not allowed then

There are 4 digits and in these 4 digits there is no digit starting with 0 we can form maximum possible pairs

For example if we consider two digit numbers

2,3 the no of 2 digit numbers are

23

32

I. E 2*1

Similarly for 3 digit numbers 2,3,4

234

243

342

324

423

432

I. E 3*2*1 ways

Similary for 4 digits 2,3,5,7

It will be 4*3*2*1=24 ways

I. E. N! When 0 excluded

In these 4 digits if there is a 0 then

For example 0,1,3,5

Answer 2

Answer:

Digits can be repeated :

Now we can fill any of the four digits in the first blank. Once it is filled, we can again fill the other one with any of the four digits since numbers CAN be reapeated. Consequently, all blanks can be filled with 4 digits. = 256 possible four digit numbers.