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The value of {:((30), (0))((30), (10))-(...

The value of `{:((30), (0))((30), (10))-((30), (1))((30),( 11)) +((30), (2))((30), (12))+....+((30), (20))((30), (30)):}`

A

`((30),(10))`

B

`((30),(15))`

C

`((60),(30))`

D

`((31),(10))`.

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