If D, E, F are mid-points of the sides BC, CA and AB respectively of ∆ABC, then AD→+BE→+CF→=______________________.

If D, E, F are mid-points of the sides BC, CA and AB respectively of �

1.	If D, E, F are mid-points of the sides BC, CA and AB respectively of ∆ABC, then AD→+BE→+CF→=______________________.
Answer» If D, E, F are mid-points of the sides BC, CA and AB respectively of $∆ A B C, then \vec{A D} + \vec{B E} + \vec{C F} =______________________.$