Question

Form the greatest and the smallest 4 digit number using the digits from 0 to 9 . how many 4 digit numbers can be formed by using these digits?

Answer 1

Answer:

9000 numbers can form (without 0 Infront)

10000 numbers can form(if 0 present infront of the numbers)

Step-by-step explanation:

1000 is the smallest number

9999 is the largest number

possibility of numbers

=(1-9)*(0-9)*(0-9)*(0-9)

= (9)*(10)*(10)*(10)

= 9000 (0 is not include Infront),,

or

=(0-9)*(0-9)*(0-9)*(0-9)

= (10)*(10)*(10)*(10)

= 10000 (0 is include Infront),,