1 503 Area Code - 搜索视频

How many different phone numbers are possible in the area code503, if the first number cannot start with a 0 or 1? Do not usecommas in your answer. Answer:

How many different phone numbers are possible in the area code503, if the first number cannot start with a 0 or 1? Do not usecommas in your answer. Answer:

VIDEO ANSWER: All right, so we want to know how many phone numbers can we make with the possible area code 503, which is kind of insignificant in the problem. …

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