How many diagonals can be drawn in a pentagon?
A. 5
B. 10
C. 8
D. 7
Answer: Option A
Solution(By Examveda Team)
A pentagon has 5 sides. We obtain the diagonals by joining the vertices in pairs. Total number of sides and diagonals, = 5C2 = $$\frac{{5 \times 4}}{{2 \times 1}}$$ = 5 × 2 = 10 This includes its 5 sides also. ⇒ Diagonals = 10 – 5 = 5 Hence, the number of diagonals= 10 – 5
= 5
Related Questions on Permutation and Combination
A. 3! 4! 8! 4!
B. 3! 8!
C. 4! 4!
D. 8! 4! 4!
A. 7560,60,1680
B. 7890,120,650
C. 7650,200,4444
D. None of these
A. 8 × 9!
B. 8 × 8!
C. 7 × 9!
D. 9 × 8!
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