What is the prime factorization of 180?

Break 180 into prime factors: 180 = 18 × 10 = (2 × 3 × 3) × (2 × 5). Thus 180 = 2 × 2 × 3 × 3 × 5, and every factor is prime. Choice A gives the complete prime factorization; the other choices still include composite factors or leave out a factor of 2.

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