Question : What is the expansion of $\left(1-\frac{1}{p}\right)^2$?
Option 1: $1+\frac{2}{p}-\frac{1}{p^2}$
Option 2: $1-\frac{2}{p}+\frac{1}{p^2}$
Option 3: $1-\frac{2}{p}-\frac{1}{p^2}$
Option 4: $1+\frac{2}{p}+\frac{1}{p^2}$
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Correct Answer: $1-\frac{2}{p}+\frac{1}{p^2}$
Solution :
$(1 - \frac{1}{p})^2 = 1 + \frac{1}{p^2} - \frac{2}{p}$
Hence, the correct answer is $1-\frac{2}{p}+\frac{1}{p^2}$.
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