Network Analysis prob-3

Activity	Predecessor
A	-
B	A
C	A
D	BC
E	A
F	DE
G	C
H	FG

BC

B starts from A & C also starts from A; They start from same nodes, and C is repeated, therefore dummy is required from C to B.

DE

D starts from BC & E starts from A;They start from different nodes, and there is no repetition of E or D,therefore heads of D&E should be merged.

FG

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