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Solution :

i. If the given vectors are coplanar, then we should be able to express one of them as a linear combination of the other two. <br> Let us assume that `3veca-7vecb-4vecc=x(3veca-2vecb+vecc)+y(veca+vecb+2vecc),` <br> where `x and y` are scalars. Since `veca, vecb and vecc` are non-coplanar, equating the coefficients of `veca, vecb and vecc`, we get <br> `" "3x+y=3, -2x+y=-7, x+2y=-4` **Two type of numbers - Vector and scalar.**

**Evolution of vector concept**

**Representation of vector direction sense magnitude of vector or length**

**Equal vectors, null vector, unit vectors, position vector, like and unlike vectors,collinear and parallel vectors**

**Co-initial vectors, coterminous vector and co-planar vectors,negative of a vector,reciprocal vectors**

**Free vector and localized vector**

**In a regular hexagon find which vectors are collinear, equal, coinitial, collinear but not equal.**

**Parallelogram law of addition of vectors**

**Properties of addition of vectors**

**Magnitude of addition of two vectors**