If A=[(1,-1),(2,-1)],B=[(a,1),(b,-1)]and...

If `A=[(1,-1),(2,-1)],B=[(a,1),(b,-1)]and(A+B)^(2)=A^(2)+B^(2)` , the value of a + b is

A

15

B

17

C

19

D

21

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The correct Answer is:

C

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