17. A curve y = f(x) is passing through (0, 0). If the slope of the curve at any point (x, y) is equal to (x + xy), then the number of solution of the equation f(x)=1, is: (a) 0 18. (b) 1 (c) 2 (d) 4 The equation of plane which passes through the point of intersection of lines = i + 2 j + 3k + (3 +j+2k) and = 3 + j + 2k + (i+2j+3k) where , = R and has the greatest distance from the origin is : 19. (a) F.(7+2)+4k)=54 (b) F.(5+4)+3)=57 (c) F.(3+4)+5)=49 ax+b, -x2 (d) F.(4+3)+5k)=50 If the function f(x) = x-5x+6, 2