Answer:
Prove:
Using 1
n³+2n = (1)³+2(1) = 1+2= 3 ---> 3/3= 1 ✔
Using 2
n³+2n = (2)³+2(2)= 8+4=12 --> 12/3=4✔
Using 3
n³+2n= (3)³+2(3)= 27+6= 33 --> 33/3=11✔
So it is proven that n³+2n is divisible by 3 for every positive integer.
I hope this helps
if u have question let me know in comments
