Question

Preethi writes fifteen 1s in a row and randomly writes + and - between each pair of consecutive 1s. find the probability that the expression preethi wrote has value 7?

Answer 1

Answer:

Antibiotics and vaccines are in some ways opposites. Antibiotics kill indiscriminately, whereas vaccines are highly targeted. Antibiotics are used to treat severe infection, whereas vaccines prevent infections from ever becoming established

Explanation:

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