Answer:
The answer is 4536.
Step-by-step explanation:
Each number is to consist of four different digits(no repetition) from 0 to 9, except that the first digit cannot be 0.
Total numerals from 0 to 9 = 10
For 1st place you have 9 options for 1st digit (0 is not selected here).
For the 2nd place you again have 9 numbers (0 is available but 1 digit less from 10 as it is already selected in first place) so, you get 9c1 ways = 9
For the 3rd place you have 8c1 ways = 8
For the 4th place you have 7c1 ways = 7
Total number of identification numbers are :
Therefore, there are 4536 different identification numbers.