The code to a lock consists of 6 alphanumeric characters, the first 4 should be numerals excluding 0, and the last 2 should be upper case letters from the alphabet. The numeric characters can be repeated, but not the letters.
How many different codes can be made, given these requirements?
9 x 9 x 9 x 9 x 26 x 25
9 x 8 x 7 x 6 x 26 x 25
9 x 8 x 7 x 6 x 26 x 26
9 x 9 x 9 x 9 x 26 x 26
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