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Q: What prime number is in common between the prime factorizations of 130 and 165?

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5

The number 5.

You do a factor rainbow to find a prime factorization. You compare prime factorizations to find a greatest common factor.

61 and 73 are both prime numbers. Prime numbers don't have prime factorizations since they only have one prime factor. The GCF of any set of different prime numbers is 1, since they don't have any prime factors in common.

it should just have 2 numbers

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No.

409 is a prime number.

233357 is a prime number.

30, 33 and 36 have 3 in their prime factorizations.

5 c

23 is a prime number.

Each composite number has its own unique prime factorization.

The number 5.

An unlimited number.

It is: 225

If the prime factorizations have no numbers in common, the LCM is their product.

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