Question 1002592
What is the sum of three consecutive even integer, if n is even the first integer
let even  number is 2n  another consecutive even number will be 2n+2 , 2n+4
sum of three consecutive even integer will be =2n+2n+2+2n+4
=6n+6 =6(n+1)
for example  n=1 than first even integer will be 2,4,6 sum will 12 
by using  solved formula is 6(n+1)=6(1+1)=12  verified