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How Many Chords Can Be Drawn Through 21 Points on a Circle? - CBSE (Arts) Class 11 - Mathematics

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Question

How many chords can be drawn through 21 points on a circle?

Solution

For drawing one chord on a circle, only 2 points are required.

To know the number of chords that can be drawn through the given 21 points on a circle, the number of combinations have to be counted.

Therefore, there will be as many chords as there are combinations of 21 points taken 2 at a time.

Thus, required number of chords  = 

  Is there an error in this question or solution?

APPEARS IN

 NCERT Solution for Mathematics Textbook for Class 11 (2018 to Current)
Chapter 7: Permutations and Combinations
Q: 3 | Page no. 153

Video TutorialsVIEW ALL [1]

Solution How Many Chords Can Be Drawn Through 21 Points on a Circle? Concept: Concept of Combinations.
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