There are 90 of them.
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There are 5 of them.
Without repetition, 300. Of these 48 will have a 2 in the units place.
That looks like it should be the same as 10 times (the number of times the digit 1 occursin the units place in the numbers from 10 to 100), which would work out to 90 .
90 of them.
There are four of them.