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EEJ MAIN Aptitude QUESTION #11021
Question 1
In a complete graph with $6$ vertices ($K_6$), how many triangles (3-cycles) are present?
  • $10$
  • $15$
  • $20$✔️
  • $30$
Correct Answer Explanation
The number of triangles in $K_n$ is $\binom{n}{3}$. For $n=6$: $\binom{6}{3} = \frac{6 \times 5 \times 4}{6} = 20$.