(iii)
The probability that getting a number divisible by $2$,
The number divisible by $2$ in the die $=2,4,6$
Now, the number of favorable outcomes to the event getting a number divisible by $2=3$
Thus,
P(getting a number divisible by $2$) = Favorable outcomes/Total number of outcomes
$=3/6$
$=1/2$
(iv)
The probability that getting a number less than $4$,
The number less than 4 in the die $=1,2,3$
Now, the number of favorable outcomes to the event getting a number less than $4=3$
Thus,
P(getting a number divisible by $2$) = Favorable outcomes/Total number of outcomes
$=3/6$
$=1/2$