Question: 1.3 Let Xi = 1 if Project i is selected, i = 1,2,3,4,5; and 0 otherwise: Which answer below indicates that if Project 2 is

  1. 1.3 Let Xi = 1 if Project i is selected, i = 1,2,3,4,5; and 0 otherwise:

Which answer below indicates that if Project 2 is selected, then Project 5 must also be selected?

  1. X2+X5=1

  2. x2-x5<=1

  3. X2+X5<=1

  4. X2<=X5

  5. x2>=x5

  6. X5<=X2

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