1.

The position vectors of A, B and C are 2hati-hatj+hatk,hati-3hatj-5hatk and x hati-3hatj+hatk respectively in DeltaABC. If angleC=(pi)/(2) then the value of x is ……………..

Answer»

`-2` and `-1`
`-2` and 1
2 and `-1`
2 and 1

Answer :D


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