Please answer this question 4th b part

​Q4. Let  a   = i ^   +   j ^ + k ^   ,   b   = i ^   and   c = c 1   i ^   +   c 2 j ^   +   c 3 k ^ . Then

      (a) If  c 1   = 1 and   c 2 = 2 ,   find   c 3   which   makes   a , b   and   c coplanar                                                                                     ( Ans   c 3   = 2 )

      (b) If c2 = –1 and c3 = 1, show that no value of c1 can make  a   , b   and   c  coplanar.

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https://www.meritnation.com/ask-answer/question/leta-i-j-k-b-i/math/12101069

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