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From 1 to 99, there are 99 numbers.

The first nine of them ... 1 through 9 ... have only one digit, so discard them.

So there are (99 - 9) = 90 positive whole numbers with 2 digits.

And another 90 negative whole numbers with 2 digits.

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Q: How many 2 digit numbers are there including 10 and 99?
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