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C_{r - 1}^{n + 2} + C_{2 r - 1}^{2 n + 2}

এর মান কোনটি?

C_{r - 1}^{n + 2}

C_{2 r - 1}^{2 n + 2}

C_{r}^{n + 2}

কোনটিই নয়

ANS : 3

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