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Question
If n ∈ N, then x2n1+y2n1 is divisible by 
Options:
A .  x + y
B .  x - y
C .  x2 + y2
D .  x2+xy
Answer: Option A
:
A
x2n1+y2n1 is always contain equal odd power.
So it is always divisible by x + y.

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