" 14."n^(3)+(n+1)^(3)+(n+2)^(3)" is divisible by "9

n^(3)+2n divisible by

If [n^(3)+(n+1)^(3)+(n+2)^(3)] is also divisible by 9. then show that, [(n+1)^(3)+(n+2)^(3)+(n+3)^(3)] is also divisible by 9.

3^(2n+2)-8n-9 is divisible by