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The system of equations lambdax+y+3z=0,2...

The system of equations `lambdax+y+3z=0,2x+muy-z=0,5x+7y+z=0` has infinitely many solutions in R. Then

A

`lambda=2,mu=3`

B

`lambda=1,mu=2`

C

`lambda=1,mu=3`

D

`lambda=3,mu=1`

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The correct Answer is:
C
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