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[" In the given figure,"O" is the centre of two "],[" concentric circles of radii "5cm" and "3cm" .From "],[" an extemal point "P" tangents "PA" and "PB" are "],[" drawn to these circles.If "PA=12cm" then "PB],[" s equal to "],[[" (a) "5sqrt(2)cm," (b) "3sqrt(5)cm],[" (c) "4sqrt(10)cm," (d) "5sqrt(10)cm]]

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