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[" 31.What are the direction ratios of n...

[" 31.What are the direction ratios of normal to the plane "],[2x-y+2z+1=0?],[[" (a) "(:2,1,2:)," (b) "(1,-(1)/(2),1)],[" (c) "(:1,-2,1:)," (d) "(1,1,2)]" [NDA 2012(I)] "]

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