Question: please write well and explain well. 49. Assume 21,12, 13 are all binary variables. To model a logical constraint if 13 is 1, both 21

please write well and explain well. 49. Assume

please write well and explain well.

49. Assume 21,12, 13 are all binary variables. To model a logical constraint "if 13 is 1, both 21 and 22 must be 0", we formulate the following constraint: 11+12

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