Question

In how many ways can a 4 digit number be formed with digits 0-9 and
repetition allowed?​

Answer 1

Answer:

So, ten's place can be filled by 8 ways. Similarly, to fill the unit place, we have 7 digits remaining. So, the unit place can be filled by 7 ways. So, the required number of ways in which four digit numbers can be formed from the given digits is 9×9×8×7=4536.

Answer 2

Step-by-step explanation:

we have to solve the problem