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If $a,b$ and $n$ are natural numbers then $a^{n-1}+b^{n-1}$ is divisible by:
\[\begin {array} {1 1} (a)\;a+b & \quad (b)\;a-b \\ (c)\;a^3+b^3 & \quad (d)\;a^2+b^2\end {array}\]
jeemain
eamcet
math
2011
q21
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Sep 20, 2013
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meena.p
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$(a)\;a+b$
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Nov 7, 2013
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pady_1
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