Solved: How many different seven-digit phone numbers begin with, Mathematics

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How many different seven-digit phone numbers begin with

Question: 1. Prove that if n is even, then (-1)ⁿ = 1.

2. How many different seven-digit phone numbers are there?

3. How many different seven-digit phone numbers begin with 231- and contain no 9s?

4. Is the product of two odd numbers even or odd? Prove it.

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Mathematics: How many different seven-digit phone numbers begin with

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Mathematics: How many different seven-digit phone numbers begin with

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