Mathematics Vector Algebra Scalar and Vector Product

If \(\overrightarrow a \) and \(\overrightarrow b\) are two unit vectors inclined to x - axis at angles 30° and 120°, then \(\left| {\overrightarrow a + \overrightarrow b } \right|\) equals

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

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