The smallest one is 100, and the largest one is 999.
There are 999 numbers up to 999, but the first 99 don't count.
So there are (999 - 99) = 900 3-digit numbers in all.
Or 1,800 if you also want to count negative 3-digit numbers.
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The greatest 3 digit number is 999, and all three digits are the same.
The largest 3-digit number=999 the smallest 3-digit number=100 total number of 3 digit number=(999-100)+1 =899+1=900
The largest 3 digit number whose digits are all primes is 777. The largest 3 digit number with different prime digits is 753.
3
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