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4.
What number when multiplied against itself will result in a
number which includes the numbers (1 - 9) in forward order,
and then descending in order from the 9? (i.e., to get the
number: 12,345,678,987,654,321)
Solution: 111,111,111 X
111,111,111 = 12,345,678,987,654,321
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