Find. Sum of probabilities of discrete random variables.

Find. Sum of probabilities of discrete random variables.
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pattererX
Given:
Variable is discrete random variables.
Discrete random variables are the variables that has definite outcome from random phenomena.
This variable is countable number and has probabilities between 0 - 1. Discrete random variables can be finite or infinite. Number of heads on tossing the coin three times is an example of discrete random variable.
Sum of probabilities of discrete random variables is always equal to 1.
$\sum {P}_{x}=1$
Thus, the sum of probabilities of discrete random variables is 1.