GOOD one dave
and thanks divye for a wonderful explanation

On Fri, Aug 19, 2011 at 11:44 PM, DK <[email protected]> wrote:

> For those of you who want an explanation of Dave's answer, please refer to
> the diagram below.
>
> | 0.5 in |-----------------| 0.5 in |
> xxxxxxxxxxxxxxxxxxxxxxx -----
> xxxxxxxxxxxxxxxxxxxxxxx 0.5 in
> xxxxxxxxxxxxxxxxxxxxxxx -----
> xxxxxx...................xxxxxx   |
> xxxxxx...................xxxxxx   |
> xxxxxx...................xxxxxx   |
> xxxxxx...................xxxxxx   |
> xxxxxxxxxxxxxxxxxxxxxxx -----
> xxxxxxxxxxxxxxxxxxxxxxx 0.5 in
> xxxxxxxxxxxxxxxxxxxxxxx -----
>
> Since the radius of the coin is 0.5 in, if the center of the coin falls in
> the x area, it will cross a grid line.
> So, probability of the coin not crossing the grid lines is area of dots /
> area of square = (1 inch square / 4 inch square) = 1/4
>
> --
> DK
>
> http://www.divye.in
> http://twitter.com/divyekapoor
> http://gplus.to/divyekapoor
>
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-- 
**Regards
SAGAR PAREEK
COMPUTER SCIENCE AND ENGINEERING
NIT ALLAHABAD

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