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10^(2n - 5)
= 10^(2n) / 10^5
= (10^n)^5 / 10^5
= 25^5 / 10^5
= (25/10)^5
= (5/2)^5
= 3125/32
10^(2n - 5) = (10^n)² - 10⁻⁵
= 625 - 1/10⁵