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Geometric Applications of PNC

There are n p...

Question

There are n points on a circle. The number of straight lines formed by joining them is equal to

^{n} C_{2}

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^{n} P_{2}

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^{n} C_{2} - 1

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None of these

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Solution

The correct option is A $^{n} C_{2}$
Number of point on circle = n
Number of straight line obtained by joining 2 point at a time = $^{n} C_{2}$

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