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If a leading zero is allowed...

The first digit can be 0-9, ten possibilities.

The second digit can be 0-9, ten possibilities.

The third digit can be 0-9, ten possibilities.

The fourth digit can be 3-9, 7 possibilities.

So there are 10x10x10x7 = 7000 such codes.

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Q: How many four digit codes can be formed using the digits 0123456789 if the last digit cannot be 0 or 1 or 2 and repetition of digits is allowed?
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