Answer :

We can write A,B,C and D as


AB = - 4i - 6j - 2k


AC = - i + 4j + 3k


AD = - 8i + j + 3k


If |AB AC AD | = 0 then ABCD are coplanar



- 4(12 + 3) + 6( - 3 + 24) - 2(1 + 32)


- 60 + 126 - 66


= 0


ABCD are coplanar.


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