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If `p q r!=0` and the system of equation `(p+a)x+b y+c z=0` `a x+(q+b)y+c z=0` `a x+b y+(r+c)z=0` has nontrivial solution, then value of `a/p+b/q+c/r` is `-1` b. `0` c.`0""` d. `not-2`

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