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There is a square board of side ‘2a’ uni...

There is a square board of side ‘2a’ units circumscribing a red circle. Jayadev is asked to keep a dot on the above said board. The probability that he keeps the dot on the shaded region is

A

`(pi)/4`

B

`(4 -pi)/4`

C

`(pi-4)/4`

D

`4/(pi)`

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