How many 3 digit pass codes can be made from the digits 0 to 9 if the first number is not allowed to be a 0?

total 900 pass codes can be made.

Step-by-step explanation:

Given situation is 3 digit pass codes are required made from the digits 0 to 9.

But the first number is not allowed to be a 0.

So for the third place we have 10 choices (0,1,2,3,4,5,6,7,8,9)

For the second place we have 10 choices (0,1,2,3,4,5,6,7,8,9)

But for the first place we have 9 choices (1,2,3,4,5,6,7,8,9)

(9 * 10 * 10) = 900

Therefore, total 900 pass codes can be made from the digits 0 to 9.