Could anyone help me solve this term?
$$\sum_{x=n}^{N}\binom{x}{n}$$
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Welcome to MSE. What does ${x_C}_n$ mean? What have you done so far? – saulspatz Sep 27 '20 at 16:37
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I assume $~^xC_n$ is the notation you were trying for. I recommend using instead the notation $\binom{x}{n}$ for a binomial coefficient as it is far more common. – JMoravitz Sep 27 '20 at 16:38
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Is $x_{C_n}$ $\binom xn$? – Angina Seng Sep 27 '20 at 16:38
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yes the binomial coefficient – Ismat Binta Islam Sep 28 '20 at 19:24