posted by Cathy .
Is this argument valid or invalid? If invalid, describe a possible situation where all of its premises are true and its conclusion is false.
Lori is unhappy with some people who did not write thank you notes. Lori will send presents next year to everyone with whom she is happy. Consequently, some people who did not write thank you notes will not get presents from Lori next year.
That statement is valid. Look at the use of the word "some".