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For the network shown in the given figure, the expected time for the activity

1-2 is 4
2-3 is 7
3-4 is 8
all the above.

Correct Answer: all the above.

Explanation:

Expected time = (Pessimistic value + 4*most likely value + Optimistic value)/6.

1-2 is 4.

2-3 is 7.

3-4 is 8.

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