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Derive the formula to find the co-ordina...

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