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Omni-MATH / Let S be the set of all 3-digit numbers with all digits in the set 1,2,3,4,5,6,7 (so in particular, all three digits are nonzero). For how many elements (abc)¯ of S is it true th… · Discussion

Discussing Let S be the set of all 3-digit numbers with all digits in the set {1,2,3,4,5,6,7} (so in particular, all three digits are nonzero). For how many elements (abc)¯ of S is it true th… · Omni-MATH

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