There are 10 points in a plan, out of which 5 are collinear. Find the number of straight lines formed by joining them.

There are 10 points in a plan, out of which 5 are collinear. Find the

1.	There are 10 points in a plan, out of which 5 are collinear. Find the number of straight lines formed by joining them.
A.	36
B.	45
C.	30
D.	35
Answer» B. 45