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Which of the following are correct in re...

Which of the following are correct in respect of the system of equations `x+y+z=8` `x-y+2z=6` and `3x-y+5z=k` 1)They have no solution if k=15 2)Theyhave infinitely many solutions if k=20 3)They have a unique solution if k=25 Select the correct answer using the code given below a) 1 and 2 only b) 2 and 3 only c)1 and 3 only d)1,2 and 3

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