What is the largest prime factor of 84?
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Correct!
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Correct answer to question 2 (Mathematics Knowledge): 7
Method
Breaking 84 down gives 2 x 2 x 3 x 7, so its prime factors are 2, 3, and 7 and the largest is 7. The choices 21 and 42 divide 84 but are not prime.
Updated: November 2026
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