1.

If x is a comples cube root of unity and A={:[(1,1,1),(1,x,x^(2)),(1,x^(2),1)]:}," then "A^(-1)=

Answer»

`(1)/(4){:[(1,X,x^(2)),(z^(2),1,x),(x,x^(2),1)]:}`
`(1)/(3){:[(1,1,1),(1,x^(2),x),(1,x,x^(2))]:}`
`(1)/(6){:[(1,1,1),(1,x^(2),x),(1,x,x^(2))]:}`
`(1)/(2){:[(1,1,1),(1,x^(2),x),(1,x,x^(2))]:}`

Answer :B


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