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Show that the four points which the posi...

Show that the four points which the position:
Vectors: `4hati + 8hatj + 12hatk, 2hati + 4hatj +6 hatk, 3hati + 5hatj + 4hatk, 5hati + 8 hatj + 5hatk` are coplanar:

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The correct Answer is:
`=-42 + 60 -18=0`
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