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AB is a diameter of circle. P is point on circle and a perpendicular line is drawn on AB at N from it. If radius is 7 cm. and PB = 12 cm. then BN is (in cm)-

A

`3(5)/(7)`

B

`10(2)/(7)`

C

`6(5)/(7)`

D

`12(2)/(7)`

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