Suppose that none of the drugs are really different from placebo. If the company uses a 5% threshold for p-values in all the tests, what is the chance that they will get at least one drug for which they will reject the null hypothesis and conclude that the drug is different from placebo

Luke started a weight-loss program. the first week, he lost x pounds. the second week, he lost pounds less than times the pounds he lost the first week. the third week, he lost 1 pound more than of the pounds he lost the first week. liam started a weight-loss program when luke did. the first week, he lost 1 pound less than times the pounds luke lost the first week. the second week, he lost 4 pounds less than times the pounds luke lost the first week. the third week, he lost pound more than times the pounds luke lost the first week.