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\frac{(1 + x)^{2}}{(1 - x)^{3}}

x^{n}

এর সহগ কোনটি ?

2 n^{3} + 2 n^{2} + n

2 n^{2} + 2 n

2n+1

2 n^{2} + 2 n + 1

ANS : 4

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