Question

how many four digit number are there if repetation of digit is alloewed

Answer 1

Step-by-step explanation:

1,2,3,4,5,6

No repetition

Four digit number

Starting with 1

Rest leftover numbers =5

Number of blanks =3

Number of digits

5

P

3

=5×4×3

=60

Answer 2

Step-by-step explanation:

What is the sum of all 4-digit numbers that can be formed using the digits 1,2,3,4 where repetition of digits is allowed? As each digit of four digit number (abcd) can take 4 options (1, 2, 3, 4) total there can be 4^4 numbers.