Activity Predecessors Duration

a none $3$

b none $6$

c none $8$

d a $7$

e b $5$

f c $10$

g c $4$

h d$,$e$,$f $5$

i g $6$

$19$ What is the EF for activity h$?$

$8$

$12$

$13$

$18($Wrong$)$

$23$

$$

$20.$ What is the LF for activity i$?$

$8$

$12$

$13$

$18($Wrong$)$