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.
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If you are asking how many number contains 7 between 1-999. The answer would be 300 :D
There are 280 of them.
997
45 of them.
There are 107 numerical palindromes between the numbers 1 and 1000, starting from 2 to 999.
There are 179 multiples of 5 between 101 and 999. 101 ÷ 5 = 201/5 → first multiple of 5 ≥ 101 is 21 x 5 999 ÷ 5 = 1994/5 → last multiple of 5 ≤ 999 is 199 x 5 → number of multiples of 5 between 101 and 999 is 199 - 21 + 1 = 179.