ত্রিভুজ সমাচার

$a, b, c ∈ \{1, 2, 3, 4, 5, 6, 7, 8, 9\}$ where $a, b, c$ indicates the three sides of $\triangle ABC$. $\triangle ABC$ is equilateral or isosceles. How many triangles can be formed?

Counting

Geometry

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