Which of following would be considered fair use?

If you flip a coin, what is P (heads) ?

Suppose you have a fair coin, this means that it has a 50% chance of getting heads and a 50% chance of getting tails.

When you toss a coin, the possible outcomes are:

1. Heads

2. Tails

The total number of outcomes are therefore two.

Hence,

P (heads) = 1/2