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## You're absolutely correct! To calculate the total number of possible combinations, you need to consider that the first digit is always 3, and there are 7 remaining variable positions.

Since each of these 7 positions can have 10 possible values (from 0 to 9), you can multiply 10 by itself seven times. This gives us 10^7, which equals 10,000,000.

Hence, there are 10 million possible combinations for a series of numbers with 8 digits, where the first digit is always 3.