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Assuming all 45 digits are different (which they will not be if they are ordinary integers), then 456, if repetitions are allowed. That is 8303765625.

If repetitions are not allowed then the number falls to 45*44*43*42*41*40 = 5864443200

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12y ago
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Q: How many 6 digit numbers can be formed with 1 to 45 digits?
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