Question

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$5 ^{n + 2} - 6 \times 5 ^{n + 1} \div 13 \times 5 ^{n + 2} - 2 \times 5 ^{n + 1}$
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Answer 1

$\frac{5^n \times 5^2-6 \times 5^n \times 5}{13 \times 5^n \div 1/5^2 -2 \times 5^n \times 5} \\ =5^n(25-30)/[5^n(13/25 -10) \\ =(-5)/[(13-250)/25 \\ =(-5)/[(-237)/25] \\ =(5 \times 25)/237 \\ \frac{125}{237}$