Q)
Let \( \overrightarrow a, \overrightarrow b, \overrightarrow c\) be three vectors of magnitude 3, 4, 2 respectively. If ech one is perpendicular to sum of other two vectors, prove that $ | \overrightarrow a + \overrightarrow b + \overrightarrow c | = \sqrt {29} .$
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