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Condition for Two Lines to Be Parallel

8. In a plane...

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8. In a plane there are 27 straight lines, of which 13 pass through the point A and 11 pass through point B. Bedsides, no three lines pass through points A and B and no two are parallel. Find the number of points of intersection of the straight lines.

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Q. In a plane, there are 37 straight lines, of which 13 pass through the point A and 11 pass through the point B, besides no three lines pass through one point, no line passes through both points A and B no two lines are parallel. Find the number of points of intersection of the straight lines.

Q. In a plane there are

37

straight lines, of which

13

pass through the point

A

11

pass through the point

B

. Besides, no three lines pass through one point, no lines passes through both points

A

B

, and no two are parallel, then the number of intersection points the lines have is equal to

Q. In a plane there are

37

straight lines of which

13

pass through point

A

11

pass through the point

B

. Besides, no three lines pass through one point, no line passes through both

A

B

, and no two lines are parallel.
Then the total number of intersection points of the lines are

Q. In a plane there are

37

straight lines of which

13

pass through point

A

11

pass through the point

B

. Besides, no three lines pass through one point, no line passes through both

A

B

, and no two lines are parallel.
Then the total number of intersection points of the lines are

Q. In a plane there are

37

straight lines, of which

13

pass through the point

A

11

pass through the point

B

. Besides, no three lines pass through one point, no line passes through both points

A

B

,and no two are parallel. Then the number of inter-section points the lines have is equal to:

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Condition for Two Lines to Be Parallel

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