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There are four 2-digit prime numbers that have 4 as one of their digits: 41, 43, 47, and 49. However, 49 is not a Prime number because it is divisible by 7. So, the correct answer is three 2-digit prime numbers with 4 as one of their digits.
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Maxine
FranWell, isn't that a happy little question! Let's think about it together. There are four 2-digit prime numbers that have the digit 4 in them: 41, 43, 47, and 49. Just like painting a beautiful landscape, sometimes all we need is a little patience and a gentle touch to find the answer.
Three
They are ;- 41,43, & 47
Any number ending is '4' is NOT a prime number, because it is an EVEn number, divisible by '2'.
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How many 5 digits numbers are there whose digits sum to 22?
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How many two-digit primes are there whose units digit is less than its ten digits?
There is no simple formula for that; I suggest you look up the prime numbers in a table of prime numbers, analyzing each prime number in the range 10-99 whether it fulfills this specific criterion.
How many 6 digit numbers can be formed using the digits 123456789?
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How many even two digit numbers are there where the sum of the digits is 5?
To find the even two-digit numbers where the sum of the digits is 5, we need to consider the possible combinations of digits. The digits that sum up to 5 are (1,4) and (2,3). For the numbers to be even, the units digit must be 4, so the possible numbers are 14 and 34. Therefore, there are 2 even two-digit numbers where the sum of the digits is 5.
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