Question 6 - A-Level Maths

6. (i) Draw the activity network described in the precedence table below, using activity on arc and the minimum number of dummies.

Activity	Immediately preceding activities
\(A\)	-
B	-
C	-
D	A, \(C\)
E	B
\(F\)	E
G	A
\(H\)	\(D , F\)
I	\(D , F\)
J	H, I

(ii) Explain why each of your dummies is necessary.