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Question : 65 of 160
Marks:
+1,
-0
Solution:
For coplanar vectors,
a⋅|b×c|=0 ⇒||=0 Substituting values we have,
||=0 R2→R2−R1 and
R3→R3→R1 ⇒ Dividing by
(1−a)(1−b)(1−c), we get
‌+‌+‌=0
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