[AMU 1981; RPET 1989; MP PET 1993; Pb. CET 2001]
A) $ 2 $
B) $ \frac{1}{2} $
C) 1
D) 3
Correct Answer: A
$ \Delta =\frac{1}{2}[1(1+1)-1(-1+1)-1(-1-1)]=2 $ .
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