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Solution

Correct Option: 3

For a triangle divided into n=4n = 4 rows of smaller triangles, the total count of triangles is given by n(n+2)(2n+1)8=4×6×98=27\frac{n(n+2)(2n+1)}{8} = \frac{4 \times 6 \times 9}{8} = 27.

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