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The coefficient of $x^3y^4z^5$ in the expansion of $(xy+yz+xz)^6$ is :

\[\begin {array} {1 1} (a)\;70 & \quad (b)\;60 \\ (c)\;50 & \quad (d)\;none\;of\;these \end {array}\]

1 Answer

(b) 60
answered Feb 27, 2014 by meena.p
 

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