The plane 2x - 3y + 6z - 11 = 0 makes an angle sin-1 (∝) with X-axis . the value of ∝ is equal to

1
\(\frac {\sqrt 2}{3}\)
2
\(\frac { 2}{7}\)
3
\(\frac {\sqrt 3}{2}\)
4
\(\frac { 3}{7}\)

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