Network Analysis prob-4

Activity	Predecessor
A	-
B	-
C	AB
D	AB
E	CD
F	CD
G	E
H	FG

AB

A & B starts from  1st node; They start from same nodes, and they are not repeated, therefore dummy is required from either A to B or B to A

CD

C & D both starts from AB;They start from same nodes, and there is no repetition of C or D,therefore dummy is required from either C to D or D to C.

FG

F starts from CD & G starts from E;They start from different nodes, and there is no repetition of F or G,therefore heads of F&G should be merged.