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  1. CliffSedge
    • 3 years ago
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    2^6 = 64 and 64-1 = 63, a multiple of nine.

  2. Rachel123
    • 3 years ago
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    So is it done by just trying out numbers to show that it has to be greater than 6?

  3. CliffSedge
    • 3 years ago
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    Sortof, it's finding the least power of 2 that is 1 more than a multiple of 9. That shows that one number is at least that many powers of 2 greater than the other, so they can't possibly have the same number of digits.

  4. Rachel123
    • 3 years ago
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    Ok, great thanks!

  5. CliffSedge
    • 3 years ago
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    yerwelcome

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