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There are 19: 17 27 37 47 57 67 70 71 72 73 74 75 76 77 78 79 87 and 97

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Q: How many two digit-numbers contain the digit 7?
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How many three digit numbers with distinct digits?

1000there aren't even 1000 three-digitnumbers...There are the digits 1 through 9 for the first digit. Then, we have 0 through 9 for the second digit - excluding the first digit. For the third digit, we have 0 through 9, excluding the two previous digits for a total of 9*9*8 =81*8 =648 three digit numbers with distinct digits.EDIT- ... to be a little more specific, if your talking about a 3-digit password or unlock code its would be 1000. _-_


How many 5 digit numbers contain exactly two 7 in them?

There are 6804 such numbers.


How many three digit numbers contain at least two sevens?

27: 077,177,277,377,477,577,677,877,977,717,727,737,747,757,767,777,787,797


How many two digits number contain the digit 4?

04,14,24,34,40,41,42,43,44,45,46,47,48,49,54,64,74,84,94.... OR 19 Digits


How many two-digit numbers do not contain the number 9?

There are 90 two digit numbers, 10 through 99. There are 18 two digit numbers containing a 9. They are 19, 29, 39, 49, 59, 69, 79, 89, and 90 through 99. Therefore, there are 72 two digit numbers that do not contain a 9.


Two digit numbers contain exactly one 4?

There are 17 of them.


How many two-digit whole numbers does not contain zero and any number greater than 1?

There is only one such number.


How may two digit-numbers contain the digit 4?

18 positive integers and 36 integers (negative and positive)


How many 2's whole numbers between 0 and 99 contain the digit?

greatest two digit number is 99. smallest whole number is 0 there fore 99-0=99


How many two-digit number contain the digit 2?

Let's count them out... 12 20 21 22 23 24 25 26 27 28 29 32 42 52 62 72 82 92 Whew... that makes 18 two-digit numbers that have a "2".


How many two digit prime numbers are there?

There are 21 two-digit prime numbers.


How many two-digit numbers are there in which the digit on the right is larger than the digit on the left?

36