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19.
{04,14, 24, 34, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 54, 64, 74, 84, 94}
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How many two digit prime numbers are there?
There are 21 two-digit prime numbers.
Two digit numbers contain exactly one 4?
There are 17 of them.
How many two digit whole numbers are increased by 18 when their digits are reversed?
7 two-digit numbers.
How many two-digit whole numbers does not contain zero and any number greater than 1?
There is only one such number.
How many two digit numbers are there?
There are 90 two-digit numbers... starting with 10 and ending with 99.
How many 5 digit numbers contain exactly two 7 in them?
There are 6804 such numbers.
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.
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 digit prime numbers are there?
There are 21 two-digit prime numbers.
Two digit numbers contain exactly one 4?
There are 17 of them.
How many two-digit numbers has a digit sum equal to 5?
There are five such numbers.
How many two digit whole numbers are increased by 18 when their digits are reversed?
7 two-digit numbers.
How may two digit-numbers contain the digit 4?
18 positive integers and 36 integers (negative and positive)
How many two-digit whole numbers does not contain zero and any number greater than 1?
There is only one such number.
How many 2-digit numbers are there in which the one digit in greater than tens digit?
How many two digit numbers are there in which the tens digit is greater than the one’s digit ?
How many 4 digit numbers are possible with no two numbers being adjacent?
There are 2941 4-digit numbers such no two of its digits differ by 1.
How many two digit numbers are there in which the tens digit is greater than the ones digit?
There are 45 of them.
