Answer:

Three or more points are said to be collinear if they lie on a single straight line.

Let A, B, C, D and E be five points such that no three of them are collinear.

Since, total number of points is

5

and we need

2

points to form a line.

∴

Total number of lines passing through the points is

5

×

2

=

10

∴

Lines passing through these five points are AB, BC, CD, DE, EA, BE, BD, CE, AC and AD.

Hence, the number of lines are 10.