1.

The vector c is perpendicular to both a = (1, -2, -1), b = (2, 1, -1) and c also satisfyies |c xx (I - j + k)| = 2 sqrt(6) then c =

Answer»

`+- (3i - j + 5K)`
`+- (-4I + 5J + k)`
`+- (I + j + k)`
none

Answer :A


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