Firephenoix
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a and b are two positive integers such that the least prime factor of a is 3 and the least prime factor of b is 5. then calculate the least prime factor of (a+b).


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susanwiederspan
a and b are both odd numbers because their least prime factors are odd. When two odd numbers are added, their sum is even.

The least prime factor of (a+b) is the least even number: 2.

Perhaps I made that too brief for you. Let me know if you need clarification. 

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