Mark the correct alternative in each of the following questions. (W) If 3 is the least prime fac...

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Mark the correct alternative in each of the following questions.
(W)
If 3 is the least prime factor of number \( a \) and 7 is the least prime factor of number \( b \), then the least prime factor of \( a+b \), is
(a) 2
(b) 3
(c) 5
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