1.

Volume of parallelogram whose adjacent sides are given by veca, vecb, vecb xx vecc is,

Answer»

18
54
12
36

Solution :`vecb xx vecc = |{:(HATI,HATJ,HATK),(1,-1,1),(4,2,4):}|=-6hati+6hatk`
`THEREFORE [VECAVECB xx vecc]=|{:(2,1,2),(1,-1,1),(-6,0,6):}|=-36`
`therefore` Volume =36


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