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How many 7 digit phone numbers can be formed if the first digit cannot be 0 or 1 and any digit can be repeated?
Updated: 11/3/2022
Wiki User
∙ 12y agoBest Answer
Using your rule - essentially, it's the simplified sum of 9999999-2000000 which is a total of 7999999 numbers !
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∙ 12y agoThis answer is:
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