1.

The system of homogenous equations (a-1)x+(a+2)y+az=0 (a+1)x+ay+(a+2)z=0 ax+(a+1)y+(a-1)z=0 has a non trivial solution if a equals

Answer»

`1/2`
`-1/2`
`2`
`-1`

ANSWER :B


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