\( x^{831}+y^{831} \) is always divisible by (a) \( x-y \) (b) \( x^{2}+y^{2} \) (c) \( x+y \) (...

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\( x^{831}+y^{831} \) is always divisible by
(a) \( x-y \)
(b) \( x^{2}+y^{2} \)
(c) \( x+y \)
(d) None of these
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