900, all numbers from 100 to 999 inclusive.
Assuming that 001, 080, etc are not allowed (that is a leading zero or two is not permitted), the smallest number with exactly three digits is 100. The largest number with exactly three digits is 999. So there are 999 - 100 + 1 = 900 numbers with exactly three digits.
890
There can be only one.
there are 899 whole numbers that have three digits.
Only 1 exists, and it is "999"
There are 27 of them.
None - since the digits used - when added together divide exactly by three. 1+3+5=9... 9/3=3. This means that ANY of the numbers created can be divisible by three.
One: 444!
Assuming you mean permutations of three digits, then the set of numbers that can be made with these digits is: 345 354 435 453 534 543 There are six possible permutations of three numbers.
There are 900 three-digit numbers.
-- 893 of them have no 4's. -- Three of them have exactly one 4: 4xx, x4x, and xx4. -- Three of them have exactly 2 4's: 44x, 4x4, and x44. -- One of them has exactly three 4's: 444. -- None has more than three 4's.
Three digits.