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If {:[(3c + 6" "a- d),(a + d" "2-3b)]:}=...

If `{:[(3c + 6" "a- d),(a + d" "2-3b)]:}={:[(12,2),(-8,-4)]:}` are equal, than value of ab - cd is

A

4

B

16

C

`-4`

D

`-16`

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