Correct Answer - B
सदिश `(10hati+3hatj),(12hati-5hatj)` तथा `(mhati+11hatj)` संरेखीये होंगे, यदि
`|{:(,10,3,1),(,12,-5,1),(,m,11,1):}|=0`
`Rightarrow |{:(,10,3,1),(,2,-8,0),(,m-10,8,0):}|=0" "[therefore R_(2)-R_(2)-R_(1),R_(3) to R_(3)-R_(1)]`
`Rightarrow 16+8m-80=0 Rightarrow 8m=64 Rightarrow m=8`