Problem Solving (PS) | Re: ­There are 9 dots on the circle. What is the ratio of number of triang

 

­Since none of the points are collinear. For triangle we have to choose \(3\) dots from the \(9\) dots .

This can be done in \({9_C}{_3} \) ways \(= 84\) ways .

For Pentagon we have to choose \(5\) dots from the \(9\) dots.

This can be done in \({9_C}{_5} \) ways \(= 126\) ways.

Required ratio \(= \frac{84}{126} = \frac{2}{3}\)  ­

Ans D

Hope it helped.­

Statistics : Posted by stne • on 05 Jul 2024, 03:36 • Replies 1 • Views 118

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