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(where a, b are integers) =

 0

 2
The correct answer is: 2
The centre of the sphere is (1, 2, –3) so if other extremity of diameter is (x_{1}, y_{1}, z_{1}), then
= 1, = 2, = –3
\ Required point is (0, 5, 7).
Hence (c) is the correct answer.
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