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Solution:
Prime factorization means expressing a composite number as the product of its prime factors.
The prime factorization of 18 is the representation of 18 as a product of prime numbers and can be done in the following way:
18 = 2 × 3 × 3 = 2 × 32
Thus, the prime factorization of 18 is 2 × 3 × 3.
Summary:
The prime factorization of 18 = 2 × 3 × 3 = 2 × 32.