Ratio in which the -plane divides the join of (1, 2, 3) and (4, 2, 1) is |
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a) |
internally |
b) |
externally |
c) |
internally |
d) |
externally |

Ratio in which the -plane divides the join of (1, 2, 3) and (4, 2, 1) is |
|||||||

a) |
internally |
b) |
externally |
c) |
internally |
d) |
externally |

1 Answer

127 votes

**(b)**

Suppose -plane divides the join of (1, 2, 3) and (4, 2, 1) in the ratio . Then, the coordinates of the point of division are

This point lies on -plane

-coordinate

Hence, -plane divides the join of (1, 2, 3) and (4, 2, 1) externally in the ratio 3 : 1

__ALTER __We know that the -plane divides the segment joining and in the ratio

-plane divides the join of (1, 2, 3) and (4, 2, 1) in the ratio i.e. externally

127 votes

127