ANSWERS: 4
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Please answer quickly!!! You have 2 days!!! Good luck!!!
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90
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If we know the first two digits, we can find out the last two digits: ab?? -> abba. There are 100 combinations of 2-digits from 00 to 99, but the first 10 (00 to 09) do not yield 2-digit numbers. So we have 90 two digit numbers and so 90 such 4-digit numbers.
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1-26-2017 The first digit can be 1 thru 9 and the second digit can be 0 thru 9 so possible combinations are 9 x 10 = 90
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