Question: 7. In a triangle test a tester is presented with three food samples, two of which are alike, and is asked to pick out the

7. In a triangle test a tester is presented with three food samples, two of which are alike, and is asked to pick out the odd one by testing. If a tester has no well developed sense and can pick the odd one only, by chance, what is the probability that in five trials he will make four or more correct decisions?

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