A certain math site's definition of probability:

"How likely something is to happen."

The site goes on to say that

"Many events can't be predicted with total certainty. The best we can say is how likely they are to happen, using the idea of probability."

I am having trouble with the word LIKELY in the statement above.

Let p = probability

Let p(A) = probability of event A happening

The math site mathisfun.com formerly defines probability this way:

Probability of an event happening =(Number of ways it can happen)/(Total number of outcomes).

I just can't make sense of the FORMAL definition above. I just want to make sense of everything and anything related to the formal definition.

Explain:

1. Number of ways a event can happen by giving examples.

2. Total number of outcomes. What does OUTCOMES mean here?

I know this is a ridiculous post to you who know probability very well. However, I have not formally studied probability since high school. I am 53 about to be 54. Long time ago, right?