Question:১১. প্রমাণ কর: `(4^n - 1)/(2^n - 1) = 2^n + 1` 

Answer সমাধান: বামপক্ষ `= (4^n - 1)/(2^n - 1)` `= ((2^2)^n - 1)/(2^n - 1)` `= ((2^n)^2 - 1)/(2^n - 1)` `= ((2^n + 1)(2^n - 1))/((2^n - 1))` [ `:. a^2 - b^2 = (a + b)(a - b)` ] `= 2^n + 1` = ডানপক্ষ `:. (4^n - 1)/(2^n - 1) = 2^n + 1` (প্রমাণিত) 

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১১. proman karo: `(4^n - 1)/(2^n - 1) = 2^n + 1`
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