24. Which of the following lines is not parallel to the other three? a. 7=(3,-5,-3) + s(2,-3,1), s e R C. x-3y+3 z+7 2 -6 b. x=t-1, y=-3t+4, z = 21-11,1 € R d. x+1= +1_-7z+11 = -2 25. What value of k will make the planes ₁: 2x-ky+3z-1=0 and ₂: 2kx+3y-2z=4 perpendicular? a. 6 C. 8 b. 4 d. 2

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