Question: A product code consists of four letters followed by three digits. Only the letters X, Y, and Z can be used (and any of the

A product code consists of four letters followed by three digits. Only the letters X, Y, and Z can be used (and any of the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 can be used). For example, YXZX333, ZZZZ959, and XZYZ704 are possible product codes.

If one such product code is chosen at random, what is the probability it includes the letter X?

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