Thanks. But you counted too many this way.
For example,
5) if 5, then: 1x2x2x2x2
there are only 5 ways, because once you select 3 as second digit, there is only one choice
Thanks. But you counted too many this way.
For example,
5) if 5, then: 1x2x2x2x2
there are only 5 ways, because once you select 3 as second digit, there is only one choice
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