There are many different strains of the E. coli bacteria, and only some of these strains are harmful.

　　Some types of bacteria found in sewage are neither disease-causing nor difficult to detect

　　directly.

　　Some of the types of bacteria found in sewage along with E. coli are not harmful to people unless the bacteria are ingested in large quantities.

　　E. coli dies out much more quickly than some of the more harmful bacteria found in sewage and then can no longer be easily detected.

　　Some of the types of bacteria found in sewage along with E. coli reproduce at a slower rate than E. coli.

　　12.The organizers of tomorrow s outdoor concert announced that it will go on tomorrow on schedule unless bad weather is forecast or too few advance tickets are sold. If the concert is canceled, refunds will be made to ticket holders. Since some ticket holders have already been issued refunds even though more than enough advance tickets were sold, it must be the case that bad weather is forecast. Which of the following is an error of reasoning con- tained in the argument?

　　It proceeds as if a condition, which by itself is enough to guarantee a certain result, is the only condition under which that result would occur.

　　It bases a conclusion that is known to require two conditions on evidence that bears on only one of those conditions.

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