94.
What is the rule for encryption in playfair cipher if the letters in a pair appear in same column?

96.
What will be the lexicographical order of combinations of 2 elements each formed from the array arr={1,2,3}?

97.
What is the objective of the knapsack problem?

100.
Consider a reference string 7, 0, 1, 2, 0, 3, 0, 4, 2, 3, 0, 3, 2, 1, 2, 0, 1, 7, 0, 1 of frame size 3. Calculate the number of page faults using optimal page replacement algorithm.