or
or
If n = 38 - 28 which of the following is not a factor of n?
n = 3^8 - 2^8 = (3^4)^2 - (2^4)^2 = (3^4 + 2^4)(3^4 - 2^4) = (81 + 16)(81 - 16) = 97 * 65
Therefore, the only answer choice that is not a factor of n is 35.
Answer: 35
