Consider the following statements : 1. A dummy activity is artificially introduced in a network when necessary. 2. A dummy activity consumes some time. 3. A dummy activity is represented by a dotted arrow. 4. A dummy activity must necessarily be ?->(Show Answer!)

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1. Consider the following statements : 1. A dummy activity is artificially introduced in a network when necessary. 2. A dummy activity consumes some time. 3. A dummy activity is represented by a dotted arrow. 4. A dummy activity must necessarily be introduced in every network. Which of the above statements are correct ?

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