She uses e-commerce or she pays by credit card. She does not pay by credit card....

She uses e-commerce or she pays by credit card. She does not pay by credit card. Using a truth table we get result ending T T F F with the T matching with T's in premsis so it is valid,

but in this problem the only Ts from the premises match with the T in ending column of truth table MY QUESTION IS WHY IS THIS INVALID WHILE THE ABOVE IS VALID DOES IT HAVE TO BE A TATUOLOGY TO BE VALID OR MATCH WITH Ts FROM PREMESIS

If you use your seat belt, you will be safer. You don’t use your seat belt. Therefore you won’t be safer.

Expert Solution

Hence for an argument to be valid ,the end column should be a tautology.

Colby Messinger answered 2 years ago

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