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If P (A) = (2)/(5), P(B) = (3)/(10) and ...

If `P (A) = (2)/(5), P(B) = (3)/(10) and P (A nnB) = (1)/(5),` then `P ((A')/(B')) . P ((B')/(A'))` is equal to

A

`5/9`

B

`5/7`

C

`(25)/(42)`

D

1

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