Each customer of Mobil Credit Corporation is given a digit n

(1 point) Get help entering answers TT This problem has multiple parts which are revealed sequentially after the preceding part has been answered correctly. Each customer of Mobil Credit Corporation is given a 9-digit number for computer identification purposes. a. If each digit can be any number from 0 to 9, how many different account numbers can they have? Answer: 3628800 b. How many different account numbers can they have if the digits were only 3 or 8? Answer 512 Note: Your answers should be integers. Do not enter commas in your answers. For example, enter 1234 and not 1,234, etc.

Solution

a)

As there are 10 digits from 0 to 9, then there are

#ways = 10^9 = 1 000 000 000 ways [ANSWER]

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b)

If there are only 2 ways for each digit there are

#ways = 2^9 = 512 [ANSWER]