Question

The sum of any five consecutive numbers is multiple of ___

• A. 2
• B. 5
• C. 7
• D. 10

Answer 1

The correct option is B

5

(1, 2, 3, 4, 5; sum = 15)

(2, 4, 6, 8, 10; sum = 30),

(1, 3, 5, 7, 9; sum = 25)

Let five consecutive numbers be n-2, n-1, n, n+1, n+2

Sum = n-2+n-1+n+ n+1+n+2

= 5n

$\therefore$ Sum of any five consecutive numbers is a multiple of 5.