Question: 20) Either prove that the wff is a valid argument or give an interpretation in which (6 points) it is false. [(x)O(xA) - (x)d(xA)] -

20) Either prove that the wff is a valid argument or give an interpretation in which (6 points) it is false. [(x)O(xA) - (x)d(xA)] - [(x)0 - (x)d](xA)20) Either prove that the wff is a valid argument or give an interpretation in which (6 points) it is false. [(x)O(xA) - (x)d(xA)] - [(x)0 - (x)d](xA)

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