MCQ
If * is a binary operation in $R$ defined as $a ^* b = a + b - ab$, then identity element for "*" will be
- A
- B1
- Cdoes not exist
- Dnone of these
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($A$) $\quad \alpha=0, k=8$
($B$) $4 \alpha-k+8=0$
($C$) $\operatorname{det}(P \operatorname{adj}(Q))=2^9$
($D$) $\operatorname{det}(Q \operatorname{adj}(P))=2^{13}$
$\frac { 4 }{ \sqrt { 2 } }$
$ -\frac { 1 }{ \sqrt { 2 } }$
$\frac { 1 }{ \sqrt { 2 } }$
$\frac { 1 }{ \sqrt { 4 } }$