Let
and
then
A. Let
and
find
which makes
and
coplanar.
B. If
and
show that no value of
can makes
and
coplanar.
Given: ![]()
For 3 vectors to be coplanar;
![]()
A. ![]()

![]()
∴ c3 = 3 for the vectors to be coplanar.
B. ![]()

![]()
∴ No value of c1 can make
as coplanar.
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