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Every proposition is either true or false, but not both. So, for each propositional variable, we have two choices.
A truth table will need $2^n$ rows if there are $n$ propositional variables.
Since, we only have one propositions $p,$ So, $2^1 = 2$ rows in truth table.
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We know that for answering any proposition there is only two choice(either True or False). As the above compound proposition uses only one propositional variable

so, its models will be  2^1 = 2 (1 variable with 2 choices).
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