Which of the following factors is not included in the prime factorization of a composite number?
A
5
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B
2
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C
1
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D
3
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Solution
The correct option is C 1 1 is the factor which is not included in the prime factorization of a composite number as 1 is always a factor of any number.
Putting 1 in the prime factorization does not make any difference as multiplication by 1 is the number itself.