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1 Give an example of a weak syllogism from everyday life. What about the inference is non-deductive? Why do you believe it? 


2 1. Give an example of a premise (meaning an

implication P��→�Q�
) and a set of background assumptions X�
 such that upon observing Q� 
 you would be more likely to believe proposition P� 
 given X�
.

2. Now give an alternate set of background assumptions X�′��
 such that you would be less likely to believe P� 
 given Q� 
 and X�′��
. 


3 Why don't we just define the plausibility (�∼�A��|��X��)��
 to be 1�−�(�A�|��X��)��
?

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