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Firstly, what a wonderful place for people to help one and other. I am glad that I have stumbled across : )

I have posted this query in advanced because to me there it is advanced but if it is basic to others then please excuse me.

I can easily work out the probability of something happening every time at general probability or odds but I fall down when working out the probability of it happening a lesser number of times.

__If there is a 43.5% of something happening on a single occasion.__

If it is run on 15 occasions, what would be the chance of it happening 12,13 and 14 times.

If it is run on 20 occasions, what would be the chance of it happening 17,18 and 19 times.

__If there is a 38% of something happening on a single occasion.__If it is run on 15 occasions, what would be the chance of it happening 12,13 and 14 times.

If it is run on 20 occasions, what would be the chance of it happening 17,18 and 19 times.

Any help, particularly in how I go about calculating so that I know for future reference would be a massive help.