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We have to assume we can use each digit only once else our number would be infinitely long. The digits that are multiples of 3 are 0 (3 * 0), 3 (3 * 1), 6 (3 * 2) and 9 (3 * 3).

We simply need to order these in descending order then:

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13y ago

What else can I help you with?