Question

Are there more seven-digit numbers that have no zeros in their decimal representation, or those that have no two adjacent identical digits in their decimal representation?

Difficulty level (1 very easy - 10 very hard): 3

Topics:
Combinatorics -> Product Rule / Rule of Product
谞注诪讛 讘专-讙讚 驻讬讬讘讬砖 Avatar
谞注诪讛 讘专-讙讚 驻讬讬讘讬砖 - 3 years ago
讗讬谉 诇讛诐 讗驻住讬诐 讘诪讘谞讛 讛注砖专讜谞讬

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