In the adjoining figure, three circles with centres P, Q and R are drawn, such that the circles w...

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In the adjoining figure, three circles with centres P, Q and R are drawn, such that the circles with centres Q and R touch each other externally and they touch the circle with centre P, internally. IfQ=10  cm, P R=8  cm and Q R=12  cm, then the diameter of the largest circle is
(W)
(a) 30  cm
(b) 20  cm
(c) 10  cm
(d) None of these

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