If \( \hat{n}=a \hat{i}+b \hat{j} \) is perpendicular to the vector...

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If \( \hat{n}=a \hat{i}+b \hat{j} \) is perpendicular to the vector \( (\hat{i}+\hat{j}) \),
\( \mathrm{P} \)
then the value of \( a \) and \( b \) may be:
W
(1) 1,0
(2) \( -2,0 \)
(3) 3,0
(4) \( \frac{1}{\sqrt{2}},-\frac{1}{\sqrt{2}} \)
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