A vector perpendicular to any vector that lies on the plane defined by x + y + z = 5 , is 

1
\(\hat i + \hat j\,\)
2
\(\hat j + \hat k\,\)
3
\(\hat i + \hat j +\hat k\,\)
4
\(2\hat i + 3\hat j +5\hat k\,\)

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