KA-0018
about 105sA three-digit code uses only the digits 1, 2 and 3, and digits may repeat. How many such codes contain at least one 3?
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Needs an idea, not just a procedure.
3 in a row to finish this ladder.
0/4 solvedA three-digit code uses only the digits 1, 2 and 3, and digits may repeat. How many such codes contain at least one 3?