Lets first talk about a since on prime factorisation it yeilds 3 as least prime no.,all other prime factors must be odd only since 2 is not there the resulting no. will be an odd no.( product of odds=odd) Similarly in b 7 is the least prime no. So it must be an odd no. Sum of two odd no. is even i.e (a+b) is even . So its prime factor (least) is 2
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