I count 14 of them.
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90 * * * * * That is clearly incorrect since there are more between 700 and 799. The correct answer is 252.
16000
There are 900 three-digit numbers, all of which are between 99 and 3,000.
Eleven digit numbers are those in the range between 9,999,999,999 and 100,000,000,000 exclusive. There are 90,000,000,000 of these.
555