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Q: How many two digit numbers contain the digit 4?

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18 of them.

There are 6804 such numbers.

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.

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

There are 21 two-digit prime numbers.

There are 17 of them.

There are 90 two-digit numbers... starting with 10 and ending with 99.

There are five such numbers.

7 two-digit numbers.

18

18 positive integers and 36 integers (negative and positive)

There is only one such number.

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