1.

Derive the formula to find the co-ordinates of a point which divide the line joining the points A(x_1,y_1,z_1) and B(x_2,y_2,z_2)internally in the ratio m:n.

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Answer :` R= ((mx_(2)+nx_(1))/(m+n),(my_(2)+ny_(1))/(m+n),(mz_(2)+nz_(1))/(m+n))`


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