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how to solve this.

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Inference 2

plumbing plane do not meet the construction code = P

I can’t build my house = Q

I hired a licensed contractor = R

P→Q  P = T Q= T

R→P   R= T

R       T

Q is valid conclusion

but ¬Q is not valid.

See above assignments for propositions

if all premises are true and conclusion is false then we say it is invalid inference

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