01 Probability Basics

Possibility of x event occurring is, $P(x) = no of possibilities of x / total no of possibilities$

Ex:- Probability of tails Possibility of side of the coin be tails is 1 and total number of possibilities are 2. $P(t) = 1 / 2 = 0.5$

Rules of probability

• Probability of any and every event falls between 0 and 1 $0 \geqslant P(x) \leqslant 1$
• When you add up all the possibilities of all the different outcomes of a certain event, the result is always equal to 1 $P(x) + P(y) + P(z) = 1$
• When a probability of something happening and probability of something not happening (complement of the event) is added, it must equal one $P(x) + P(x)^c = 1$