Question

Prove that the sum of first n even numbers is n(n+1)

Answer 1

Answer:

n ka power 2 + n

Step-by-step explanation:

=n×n + n× 1

=n ka power 2 + n

Answer 2

Answer:

Step-by-step explanation:

let's assumse that n = 5,

so 5(5+1) = 5*6 = 30

sum of first 5 even numbers: 2 + 4 + 6 + 8 + 10 = 30

check that, 5(5+1)= 2+4+6+8+10

                    30=30

hence, proven