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CAT 2025 Permutations and Combinations — Previous Year Question

Year

CAT 2025

Section

Quantitative

Topic

Permutations and Combinations

Difficulty

Hard

Question

Slot-1

In a computer game, each move requires pressing a button. When the button is pressed for the first time, the computer randomly chooses a cell from a 4×44 \times 4 grid of sixteen cells and puts an "X" mark on that cell. When the button is pressed subsequently, the computer randomly chooses a cell from the remaining unmarked cells and puts an "X" mark on that cell. This goes on till the end of the game. The game ends when either all the cells in any one row, or all the cells in any one column, are marked with "X". What is the maximum possible number of times a player has to press the button to finish the game?

16

10

13

4

6

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