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The value of .^(15)C(0)^(2)-.^(15)C(1)^(...

The value of `.^(15)C_(0)^(2)-.^(15)C_(1)^(2)+.^(15)C_(2)^(2)-"...."-.^(15)C_(15)^(2)` is
a. `15`
b. `-15`
c. `0`
d. `51`

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