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Sum of Infinite Terms of a GP

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Question

Expand : $(a - b)^{2}$

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Solution

Solution :-
$\Rightarrow (a - b)^{2}$

$\Rightarrow (a - b) (a - b)$

$\Rightarrow a^{2} - a b - a b + b^{2}$

$\Rightarrow a^{2} - 2 a b + b^{2}$

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