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Circles with centres P,Q& S are touching...

Circles with centres P,Q& S are touching each other externally as shown in the figure at points A, B & C. If radii of circles with cenres P, Q & S are 1,2 and 3 respectivelu then the length of chord AB is `"_______"`

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  15. If U = {1,2,3,4,5,6,7,8,9,10}, A = {1,2,3,5}, B = 2,4,6,7} and C = {2,...

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