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Q.
How many lines can be drawn from 6 points on a circle?
Rajasthan PETRajasthan PET 2010
Solution:
$ \because $ Number of straight lines drawn from n points
$ {{=}^{n}}{{C}_{2}} $
$ \therefore $ Number of straight lines drawn from 6 points
$ {{=}^{6}}{{C}_{2}}=\frac{6\times 5}{2}=15 $