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Show that the points A, B and C with position vectors \( \overrightarrow a = 3\hat i - 4\hat j - 4\hat k, \overrightarrow b = 2\hat i - \hat j + 4\hat k \: and \: \overrightarrow c = \hat i - 3\hat j - 5\hat k,\) respectively, form the vertices of a right angled triangle.

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