3 to the zero power
n^0 = 1 unless n=0
consider the rules of exponents
n^6/n^2 = n^(6-2) = n^4
when dividing, subtract exponents. so,
n^6/n^6 = n^(6-6) = n^0 = 1
consider the rules of exponents
n^6/n^2 = n^(6-2) = n^4
when dividing, subtract exponents. so,
n^6/n^6 = n^(6-6) = n^0 = 1