Posted by **raja harishchandra** on Friday, June 14, 2013 at 6:46am.

Consider a 25×25 grid of city streets. Let S be the points of intersection of the streets, and let P be the set of paths from the bottom left corner to the top right corner of which consist of only walking to the right and up. A point s is chosen uniformly at random from S and then a path p is chosen uniformly at random from P. Over all (s,p) pairs, the probability that the point s is contained in the path p can be expressed as a/b where a and b are coprime positive integers. What is the value of a+b?

## Answer this Question

## Related Questions

- maths - Consider a 25×25 grid of city streets. Let S be the points of ...
- math - Consider a 25×25 grid of city streets. Let S be the points of ...
- math - Consider a 25×25 grid of city streets. Let S be the points of ...
- math - Consider a 25×25 grid of city streets. Let S be the points of ...
- math - Consider a 25×25 grid of city streets. Let S be the points of ...
- math - Consider a 25×25 grid of city streets. Let S be the points of ...
- math - A dog is standing at the bottom left corner of a grid of 46×46 streets. ...
- maths - A dog is standing at the bottom left corner of a grid of 46×46 streets. ...
- algebra - There are two similar triangles. The angles are: from top to bottom ...
- Physics - At each corner of a square of side script i there are point charges of...