Book Maths Puzzle

How many 8 digit mobile numbers can be formed if any digit can be repeated and 0 can also start the mobile number?

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Book Other Question

A company has 10 software engineers and 6 civil engineers. In how many ways can they be seated in a round table so that no two of the civil engineers will sit together? How many 8 digits mobile numbers can be formed if at least one of their digits is repeated and 0 can also start the mobile number?