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The value of [[a,b,c,d],[-a,b,c,d],[-a,-...

The value of `[[a,b,c,d],[-a,b,c,d],[-a,-b,c,d],[-a,-b,-c ,d]]` is

A

`-8 a b c d`

B

abcd

C

`4 a b c d`

D

`6 a b c d`

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The correct Answer is:
A
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