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If the matrix A = ((1,x,-1),(-1,3,2),(2,...

If the matrix `A = ((1,x,-1),(-1,3,2),(2,1,1))` is singular, then the value of 'x' is :

A

`x = (8)/(5)`

B

`x= (-8)/(5)`

C

`x=(5)/(8)`

D

`x=1`

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