Question: write the given argument symbolically, and then use rules of inference to show that the argument is valid. Hypotheses: All natural numbers are integers.

write the given argument symbolically, and then use rules of inference to

write the given argument symbolically, and then use rules of inference to show that the argument is valid. Hypotheses: All natural numbers are integers. Some natural numbers are even. Conclusion: Some integers are even. (We let P(x) be xis a natural number" ,Q(x) be x is an integer" ,R(x) be x is even" .)

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