Which one of the following is the common factor of (4743 + 4343) and (4747 + 4347) ?
When $ n $ is odd, ( x $ n $ + $ a $$ n $) is always divisible by $ x $ + $ a $.
$\therefore$Each one of 4743 + 4343 and 4747 + 4347 is divisible by 47 + 43.
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