A polygon has prime number of sides. Its number of sides is equal to t

1.	A polygon has prime number of sides. Its number of sides is equal to the sum of the two least consecutive primes. The number of diagonals of the polygon is(A) 4 (B) 5 (C) 7 (D) 10
Answer» (B) 5 The two least consecutive prime numbers are, 2 and 3 Sum of two numbers = 2 + 3 = 5 By using formula = n(n – 3)/2 = 5(5 – 3)/2 = (5 × 2)/2 = 10/2 = 5

A polygon has prime number of sides. Its number of sides is equal to the sum of the two least consecutive primes. The number of diagonals of the polygon is(A) 4 (B) 5 (C) 7 (D) 10

Answer»

(B) 5

The two least consecutive prime numbers are, 2 and 3

Sum of two numbers = 2 + 3 = 5

By using formula = n(n – 3)/2

= 5(5 – 3)/2

= (5 × 2)/2

= 10/2

= 5