Question: Multiple Choice Question. Read carefully. Let Y1,Y2 and Y3 be 01 variables whose values indicate whether plant i is open. for i=1,2,3. In other words,

Multiple Choice Question. Read carefully. Multiple Choice Question. Read carefully. Let Y1,Y2 and Y3 be 01 variables

Let Y1,Y2 and Y3 be 01 variables whose values indicate whether plant i is open. for i=1,2,3. In other words, for i=1,2,3,Yi=1 if plant i is open and Yi=0 if plant i is closed. Which of the following answers indicates that at least one of the plants must be open? a. Y1+Y2+Y31 b. Y1+Y2+Y31 c. Y1+Y2+Y3=1 d. Y1Y2Y3=0

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