JEE Math Practice Question
If the system of equations $$x+4 y-z=\lambda, 7 x+9 y+\mu z=-3,5 x+y+2 z=-1$$ has infinitely many solutions, then $$(2 \mu+3 \lambda)$$ is equal to :
- A.$$-2$$
- B.2
- C.3
- D.$$-3$$
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