Question

if "n" natural number then 9 power 2n -4 power 2n is always divisible by

Answer 1

we can look at that by putting the value of n as if we put n=1 then we have
81-16=65 which is divisible by 5 and 13 if we put n=2 then,
6561-256=6305 which is also divisible by 13 and 5 so, that no. is always divisible by 5 and 13