The number of diagonals in a octagon will be | MATH - DEFINITON OF COMBINATIONS, CONDITION COMBINATIONS, DIVISION INTO GROUPS, DERANGEMENTS | SolveeIt | Solveeit

Today, August 18

Question

The number of diagonals in a octagon will be

A

28

B

20

C

10

D

16

Answer

20

Explanation

Solution

Number of diagonals = $8C_{2} - 8$ = $28 - 8$ = 20.