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B
−2
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C
−12
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D
1
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Solution
The correct option is C−12 Given, (a+b)=1 (a−b)=7 Squaring the above two equation,we get, a2+b2+2ab=1 (i) a2+b2−2ab=49 (ii) Subtracting the two equations, we get 4ab=−48 =>ab=−12