There are 280 of them.
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45 of them.
There is only one 7. Whether it's between 1-999, or between 1-999,999,999. Now, if the question was how many numbers that contains 7 in it (i.e., 17, 27, 70, 750) I am not sure. I believe it is 280.
997
The answer is ‎300. (9,19,29,39,49,59,69,79,89,90,91,92,93,94,95,96,97,98,99) = 20 20*10 (ten hundreds) = 200 Add another 100 for the nine hundred (from 900 to 999) 200+100 = 300
100 *EDIT* to the idiot who said 100, you would have 100 billion. to put it in ways to understand, if you had 999 billion, just add one more billion and you have quadrillion, and you would need 1 quadrillion past 999 quadrillion to reach quintillion. so... many many many billions