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How many links are deletable in following AON network?

How many links are deletable in following AON network? Correct Answer 1

​Concepts:

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Activity ‘2’ and ‘3’ start once activity ‘1’ is over so, links 1-2 and 1-3 are not deletable.

Activity ‘5’ starts after finishing of activity ‘2’, so link 2-5 is not delete able.

Activity ‘7’ starts when ‘5’ and ‘6’ are completed so links 5-7 and 6-7 are not deletable.

Activity ‘4’ starts when 1 is finished so link 1-4 is not deletable.

Activity ‘6’ starts when ‘4’ occurs so links 4-6 are not deletable.

The only extra link is left is 1-6 which is delectable as such activity 4 starts when ‘1’ is finished, this relation is already established by links 1-4 and then 4-6, and hence, there is no need for a link 1-6.

Therefore, only one link 1-6 is delectable in the entire network. 

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