What is the minimum number of different numerals needed to fill a 3×3 square matrix?
Explanation:
A number say ‘x’ can be filled in four corner cells. Another number say ‘y’ can be used in the central cell. Now the remaining cells are middle cells of top row, bottom row, left column and right column. Two more numerals can be used to fill these cells. Assume that ‘z’ and ‘w’ are those numerals.
Thus,
Thus, four different numerals are required.
Therefore, the required answer is 4.
Answer: 4
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