Let S = {s1, s2, s3, s4, s5, s6} be the sample space associated with an experiment having the following probability distribution: 
Find the probability of the event A = {s1, s3}.
Definitions:
Short-Run Supply Curve
A graphical representation showing the relationship between the price of a good and the amount that producers are willing to supply, over a short period.
Output
The quantity of goods or services produced by a firm, industry, or economy in a given time period.
Average Variable Cost
The total variable costs divided by the quantity of output produced, indicating the variable cost of producing each unit.
Marginal Cost
The price of manufacturing an additional unit of a product or service.
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