First slide
Algebra of vectors
Question

If  a,b and c  are non-coplanar vectors and  λ is a real number,if the vectors a+2b+3c,λb+μc and (2λ1)c  are coplanar then the number of values of λ are

Moderate
Solution

For coplanar vectors 1230λμ002λ1=0

 or  (2λ1)λ=0 or λ=0,12

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