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How many 4's are used to write all two digit prime numbers? - Answers

Well, if you think about it, a prime can never end in 4, because then it would be divisible by 2. So the only numbers you need to check are 41, 43, 45, 47, and 49. Can you take it from there?



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How many 4's are used to write all two digit prime numbers? - Answers

https://math.answers.com/math-and-arithmetic/How_many_4's_are_used_to_write_all_two_digit_prime_numbers

Well, if you think about it, a prime can never end in 4, because then it would be divisible by 2. So the only numbers you need to check are 41, 43, 45, 47, and 49. Can you take it from there?



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https://math.answers.com/math-and-arithmetic/How_many_4's_are_used_to_write_all_two_digit_prime_numbers

How many 4's are used to write all two digit prime numbers? - Answers

Well, if you think about it, a prime can never end in 4, because then it would be divisible by 2. So the only numbers you need to check are 41, 43, 45, 47, and 49. Can you take it from there?

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      Well, if you think about it, a prime can never end in 4, because then it would be divisible by 2. So the only numbers you need to check are 41, 43, 45, 47, and 49. Can you take it from there?

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