10 ...
They are:
20, 21, 22, 23, 24, 25, 26, 27, 28, 29
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There are 20: 70-79, 170-179
3
There are infinitely many such numbers. For example, 123,456,063
There are infinitely many such numbers. One is 4568231432.756
there are no 3 digit tis two digit! :) * * * * * 90 of them.