Q12 of 51 Page 26

Let and Then,

If and show that no value of can make and coplanar.

Formula: -


andthen,



(iii)Three vectors are coplanar if and only if


we know that are coplanar if





now, using



⇒ 0 – 1(c3) + 1(2) = 0


⇒ c3 = 2


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