Question

5^n+1 -2×5^n/3×5^n-2

Answer 1

$frac{5^{n+1}-2cdot5^n}{3cdot5^{n-2}}= frac{5^ncdot5-2cdot5^n}{3cdot5^ncdot5^{-2}}= frac{5^n(5-2)}{3cdot5^ncdot5^{-2}}= frac{1}{5^{-2}}= 5^2=5$