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1 + x)^{44}

এর বিস্তৃতিতে 21 তম পদ-

{}^{44}C_{20} x^{40}

{}^{44}C_{21} x^{21}

{}^{20}C_{44} x^{21}

{}^{44}C_{20} x^{20}

ANS : 4

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