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.

61 and 73 are prime numbers. Prime numbers don't have prime factorizations, since their only prime factors are themselves. Since these would have to be different numbers, they don't have any prime factors in common. The GCF of any set of prime numbers is 1.

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The number 5.

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Each composite number has its own unique prime factorization.

An unlimited number.

It is: 225

Dumb...its 3 and 3...