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3 is the least factor of a+b

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becz 3 is also the multiple of a+b
example... 3 is the least prime factor of 27, 7 is the least prime factor of 49, then 49 +27 =76 ,it has 2 as least prime factor.
but these are perfect square no.
u can explain ur answer...so that we can understand ur logic well :)
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