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The value of k for which the centres of the circles x2 + y2 = 1, x2 + y2 + 6x – 2y = 1 and x2 + y2 – 6kx + 4y – 1 = 0 are collinear, is __________.

Answer» The value of k for which the centres of the circles x2 + y2 = 1, x2 + y2 + 6x – 2y = 1 and x2 + y2 – 6kx + 4y – 1 = 0 are collinear, is __________.


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