activity	Estimated duration (in months)
-	optimistic	most likely	pessimistic
1-2	2	2	14
1-3	2	8	14
1-4	4	4	16
2-5	2	2	2
3-5	4	10	28
4-6	4	10	16
5-6	6	12	30

1) find the critical path of the project.

2) find the planned project duration

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