Part 1. Definition
In this task, you need to provide the correct option for a given problem on probability from the provided options.
Part 2. Example
Problem: in a throw of a coin find the probability of getting a tail ? 
Options: a ) 1 / 2 , b ) 1 / 3 , c ) 1 / 4 , d ) 2 / 5 , e ) 2 / 7
Answer: a
Explanation: "s = { h , t } e = { t } p ( e ) = 1 / 2 answer is a"
Part 3. Exercise
Problem: three coins are tossed . find the probability of at least 2 tails ? 
Options: a ) 1 / 2 , b ) 2 / 3 , c ) 1 / 4 , d ) 1 / 8 , e ) 3 / 8
Answer:
a