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 Post subject: Sum of prime factors of 550Posted: Sun Oct 30, 2011 3:45 pm

Joined: Sun Oct 30, 2011 3:42 pm
Posts: 2
What is the sum of the prime factors of 550?

The prime factors are: 1, 5, 11, 2. The sum is therefore 19 but the answer choice only has 18. Should 1 not be counted as a prime factor?

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 Post subject: Re: Sum of prime factors of 550Posted: Mon Oct 31, 2011 8:00 am

Joined: Thu Feb 12, 2009 6:32 pm
Posts: 497
Actually, 1 isn't prime, so it shouldn't be counted.

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