How many mobile phone numbers can be formed if the network code begin with 0 and 9 and the seven-digit number cannot begin with 0 or 1?

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Q: The CEO is 3 times as old as the chemical engineer when the CEO was as old as the chemical engineer…

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Q: Aira's average score on her six tests is 98 points. The score range for each test is 0 points to 100…

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Q: Calculate the number of words out of the four letters that can be made from letters (a b c d e f g h…

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Q: Match each question with its answer.

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