You can't - unless you're including using bases other than base 10. In base 3, the number 6 (2x3) is written as 20.
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use the secind derivative
27 threes are in 81
it describes itself. 1 zero, 2 ones, 3 twos, and 2 threes
29 (with a reminder of 2)
There are four threes in a standard deck of cards.