1.

The direction ratios (d,r,'s) of the normal to the plane throuth (1, 0, 0) and (0, 1, 0) which makes an angle \[\pi /4\]with the plane \[x+y=3\]are

A. \[1,\,\sqrt{2,}\,1\]          
B. \[1,\,\,1,\,\,\sqrt{2}\]
C. \[1,\,\,1\,,\,\,2\]  
D. \[\sqrt{2,}\,1,\,1\]
Answer» C. \[1,\,\,1\,,\,\,2\]  


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