Answer:
Generally used Symbol for unknown value is x and other letters.
Step-by-step explanation:
Unknown probability of some event A is denoted as P(A) or PA. You might want to borrow notations from outside mathematics if there is none which suits you.
Variables and Constants
In algebra, symbols (usually letters) are used to represent numbers. To solve math problems, you should know what variables and constants are. Here is an introduction to the terms variables and constants. A variable is a letter or symbol used as a placeholder for an unknown value.
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