Question 1197903
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The odds in favor of event s against event s' are  248 : (1000-248), which is the same as 248 : 752,

or, after canceling the greatest common divisibility factor of 8, 31 : 47.       <U>ANSWER</U>
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Solved.


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In order for do not confuse yourself and other people around, do not use the symbol p(s) for odds, 

since p(s) is the standard designation symbol for the probability, which is close, but still different conception from the odds.