This is not really a h/w question but one thing I so not understand with this precedence table in critical path analysis , why would it needs two dummies?(adsbygoogle = window.adsbygoogle || []).push({});

Activity. | Depends On

A | -

B | -

C | A

D | B

E | B,C

F | B,C

I drew this activity network and I only used 1 dummy to represent the dependence of E , F didn't need another dummy variable.

Can anyone explain why? Hence draw an activity network to show .

Thanks

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# CPA problem (dummies)

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