A) 220
B) 270
C) 282
D) 342
Correct Answer: D
Solution :
Total number of triangles = Number of triangle with vertices on sides (PQ, OR, RS + OR, Rt PS + RS, PS, PQ + PS, PQ, OR) \[{{E}_{n}}=\frac{-13.6}{({{n}^{2}})}eV\] \[\therefore \] = 60 + 120 + 90 + 72 = 342
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