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If $m [-3 \quad 4]+n [ 4 \quad -3]=[10 \quad -11]$ then $3m+7n$ is equal to :

\[\begin {array} {1 1} (a)\;3 & \quad (b)\;5 \\ (c)\;10 & \quad (d)\;1 \end {array}\]

1 Answer

(d) 1
answered Feb 27, 2014 by meena.p
 

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