Thank you to all of you i.e.Common Zenz , Current, thoughtfulfellow, tonyd and spamwolf. All your answers are right. And now the funny thing, after checking your answers and method (which was quite different from mine), i decided to post my solution and it was while typing when i realized That I MADE ONE OF THE MOST SILLIEST MISTAKES bcoz of which the answer which shud have been = 37/72 = 111/216 , turned out to be 135/216. Similar sort of error was in the 2nd part. However i am glad that you all participated. Will post some problems, if i come across some and hopefully not mess up the answers :D