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What is the largest prime factor of 399?

A. 7

B. 13

C. 17

D. 19

E. 21

Now, 399/19 = 21 = 3 x 7 (note that 21 is not a prime number).
Since 399 = 3 x 7 x 19, the largest prime factor is 19.

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Taken: 21 times

Added: 11/12/2008

Liked: 1 time

Taggged: Math, SAT

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