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Factor tree of 45 illustrating prime factorization into 3 × 3 × 5.

Factor tree of 45 showing prime factorization with numbers 45, 3, 15, 3, and 5 in blue and orange nodes.

Factor tree of 45 showing prime factorization with numbers 45, 3, 15, 3, and 5 in blue and orange nodes.

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