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If A = [{:( 1 , 2 ) , (5 , 6) :}] , B = ...

If A = `[{:( 1 , 2 ) , (5 , 6) :}]` , B = `[{:( 3 , 5 ) , (x , -4) :}]` and `A + B = [{:( 4 , 7 ) , (6 , 2) :}]` , then the value of x must be

A

6

B

1

C

0

D

`-1`.

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The correct Answer is:
B
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