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  1. A common factor of ( 4143 + 4343 ) and ( 4141 + 4341 ) is ...
    1. ( 43 - 41 )
    2. ( 4141 + 4341 )
    3. ( 4143 + 4343 )
    4. ( 43 + 41 )
Correct Option: D

We know that when m is a odd number ( xm + am ) is divisible by ( x + a ).
∴ Each one is divisible by (41 + 43).
So Common factor = (41 + 43).


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