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{(1 + x)}^{2 n}

x^{n + 1}

এর সহগ-

2 {n_{C}}_{n + 1}

2 {n_{C}}_{n}

2 {n_{C}}_{n - 1}

2 n + {1_{C}}_{n}

কোনটিই নয়

ANS : 1

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