CAT DILR Questions | CAT Analytical Reasoning questions
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Comprehension
You are given an n×n square matrix to be filled with numerals so that no two adjacent cells have the same numeral. Two cells are called adjacent if they touch each other horizontally, vertically or diagonally. So a cell in one of the four corners has three cells adjacent to it, and a cell in the first or last row or column which is not in the corner has five cells adjacent to it. Any other cell has eight cells adjacent to it.
CAT/2018.1
Question . 71
What is the minimum number of different numerals needed to fill a 3×3 square matrix?
Explanatory Answer
Method of solving this CAT DILR Question from Analytical Reasoning question
Correct Answer: 4
Solution:
Let us fill out the 4 corner squares with the same numeral
The center cell has to be different from everything else, so let us worry about it right at the end. We can accommodate cells (2,1) and (2,3) with the same number. We can also fill (1, 2) and (3,2) with the same number
The center cell has to be a different number.
Now, this is feasible. Question is, can we fill with only 3 numbers?
Note that the center cell has to be different from everything else.
So, if we had to fill the entire matrix with only 4 numbers, we would have to fill the 8 border squares with only 2 numerals.
This is impossible.
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