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Choose the correct alternative : [MCQ] If `E(T_1) = theta_1 + theta_2` and `E(T_2) = theta_1 - theta_2`, then the unbiased estimator of `theta_2` is--

A

`T_1 + T_2`

B

`T_1 - T_2`

C

`(T_1 -T_2)/2`

D

None of these.

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