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1. Express each of the given points into its equivalent vector

a) A(2,1,-5)

b) A(1,4,6) B(5,-3,0)

2. Find the lengths of the medians of the given triangles ABC

a) A(2,1,3) B(3,-1,-2) C(0,2,-1)

I need solutions and answers since I really can't understand. Please help if it's not too much trouble. Thank you.