If you mean 3-digit numbers whose digits are in decreasing order, then the answer is 20.
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There are 90 palindromic numbers between 100 and 1000
There are 67 numbers between 32 and 100.
There are 98 numbers are between 1 and 100 that are divisible by five.
There are 25 prime numbers between 1 and 100.
Infinitely many.