JEE MATHEMATICS MCQ: PERMUTATIONS

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Anil have tiled his square bathroom wall with congruent square tiles. All the tiles are red, except those along the two diagonals, which are all blue. If he used 121 blue tiles, then the number of red tiles used are

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Correct option: C

3600

Option C (3600) is correct because with 121 blue tiles, the square is 61x61, and subtracting the blue tiles leaves 3600 red tiles.

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