1.

The system of equations:`x+y+z=5``x+2y+3z=9``x+3y+lambdaz=mu`has a unique solution, if`lambda=5,mu=13`(b) `lambda!=5``lambda=5,mu!=13`(d) `mu!=13`

Answer» `2 lamda + 3 + 3 - 2 - 9 - lamda != 0`
`lamda != 5`
`/_\_3 = |(1,1,5),(1,2,9),(1,3,mu)| != 0`
`2 mu + 15 + 9 - 10 - 27 - mu != 0`
`mu != 13`
option b is correct


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