Answer:
Step-by-step explanation:
Let us first find the number of possible credit card numbers that can be formed with the numbers 0 - 9.
We want to form a 16 digit number out of 10 digits, so, we have:
There are numbers that can be formed.
There are only 100 million valid numbers (). Let the number of valid numbers be n.
Therefore, the probability of picking a number that is valid is:
P(valid) = n / N