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ZIP codes in a country consist of three numbers and three letters in alternating format for example, 3g2 h8n. a. How many possible ZIP codes

ZIP codes in a country consist of three numbers and three letters in alternating format for example, 3g2 h8n.

a. How many possible ZIP codes are there if zero and the letter O cannot be used?

b. How many possible ZIP codes are there if zero and the letter O cannot be used and the first and the first ?

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