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Let vec r1, vec r2, vec r3, , vec rn b...

Let ` vec r_1, vec r_2, vec r_3, , vec r_n` be the position vectors of points `P_1,P_2, P_3 ,P_n` relative to the origin `Odot` If the vector equation `a_1 vec r_1+a_2 vec r_2++a_n vec r_n=0` hold, then a similar equation will also hold w.r.t. to any other origin provided a. `a_1+a_2+dot+a_n=n` b. `a_1+a_2+dot+a_n=1` c. `a_1+a_2+dot+a_n=0` d. `a_1=a_2=a_3dot+a_n=0`

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