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The number of {n} digit numbers which consists of the digit 1
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The number of digit numbers which consists of the digit 1 and 2 only if each digit is to be used at least nece is equal to 510, then is equal to ________.

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Question Text
The number of digit numbers which consists of the digit 1 and 2 only if each digit is to be used at least nece is equal to 510, then is equal to ________.