Where I got stuck on the 'single trial' of the Bernoulli distribution

I got stuck on the Bernoulli distribution in my statistics class.When I heard the explanation, "The Bernoulli distribution is ...
The Irish Times

That’s Maths: Jakob Bernoulli and the law of large numbers

Jakob Bernoulli, head of a dynasty of brilliant scholars, was one of the world's leading mathematicians. His great work, Ars Conjectandi, published in 1713, included a profound result that he ...