Answered: (5a + 6b+7c), (7a - 8b+ 9c) and (3a +… | bartleby

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Show that the vectors
(5a +67
+7c), (7a - 8b -
8b + 9c) and (3a + 20b + 5c)
→ →→
are coplanar, a, b, c being three non-collinear vectors.

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