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Let vecu=5veca+6vecb+7vecc,vcc=7veca+vec...

Let `vecu=5veca+6vecb+7vecc,vcc=7veca+vecb+9vecc and vecw=3veca+20vecb+5vecc` where `veca,vecb,vecc` are non zero vectors.If `vecu=lvecv+mvecw` then the values of l and m respectively are (A) `1/2,1/2` (B) `1/2,-1/2` (C) `-1/2,1/2` (D) `1/3,1/3`

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