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If a,b, c are real and a^(2) + b ^(2) + ...

If a,b, c are real and `a^(2) + b ^(2) + c ^(2) = 2 (a - b - c) -3, `then the value of `a + b + c` is

A

3

B

0

C

`-1`

D

1

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