Main 

int num1[100], num2[100], total[100]

for i = 0 to 99
do
  total[i] = num1[i] + num2[i];
done

Least recently used

Main paged in

Data VM Page 3K Total   2K Num2   1K Num1   0K Main  0	Frame Data 2K   1K   0K  M

N1 paged in and element stored in accumulator

Data VM Page 3K Total   2K Num2   1K Num1  1 0K Main  0	Frame Data 2K   1K  N1 0K  M

N2 paged in and element added to accumulator

Data VM Page 3K Total   2K Num2  2 1K Num1  1 0K Main  0	Frame Data 2K  N2 1K  N1 0K  M

Because Main is the drive and is invoking the total reference, it stays.
Total paged in after N1 paged out and total written from accumulator

Data VM Page 3K Total  1 2K Num2  2 1K Num1   0K Main  0	Frame Data 2K  N2 1K  T 0K  M

Next itteration
N1 paged in after N2 paged out

Data VM Page 3K Total  1 2K Num2   1K Num1  2 0K Main  0	Frame Data 2K  N1 1K  T 0K  M