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Let ABCD is trapezium such that overline...

Let `ABCD` is trapezium such that `overline(AB) = 3 overline(DC). E` divides line segment `AB` internally in the ratio `2:1 and F` is mid point of `DC.` If position vector of `A, B and C` are `vec a,vec b and vec c` respectively then find vector `FE.`

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