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15-07-2018
Mathematics

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If least prime factor of p is 3 and least prime factor of q is 5 , then what is least prime factor of (p+q)?

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15-07-2018

We conclude 2 isn't a factor of p or q (since their least factors are 3 and 5 respectively), i.e. p & q are both odd. So the sum is even and its least prime factor must be the smallest prime, 2.

Answer: 2

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