Question

okay what is the sum of even integers? easy question​

Answer 1

The sum of even integer = n(n + 1) / 2

Answer 2

Answer:

n ( n + 1 )

Step-by-step explanation:

The sum of the first n even integers is

2 + 4 + 6 + ... + 2n

= 2 × ( 1 + 2 + 3 + ... + n )

= 2 × n ( n + 1 ) / 2

= n ( n + 1 )

Example:

The first 3 even integers.

2 + 4 + 6 = 12

n = 3  =>  n ( n + 1 ) = 3 × 4 = 12