Compute the magnitude of the following vectors : $\overrightarrow a = \hat i + \hat j + \hat k, \overrightarrow b = 2\hat i - 7\hat j - 3\hat k\: and \: \overrightarrow c = \frac{1}{\sqrt 3}\hat i + \frac{1}{\sqrt 3}\hat j - \frac{1}{\sqrt 3}\hat k$

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