Three points P(2x, x+3), Q(0,x) and R(x+3,x+6) are collinear, then x is :
Three points P(2x, x+3), Q(0,x) and R(x+3,x+6) are collinear, then x is :
(a) 0
(b) 2
(c) 3
(d) 1
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