Ononot — For X \sim \text{Binomial}(n, p), the probability P(X \ge k)

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For $X \sim \text{Binomial}(n, p)$ , the probability $P(X \ge k)$ can be expressed using the regularized incomplete Beta function $I_x(a, b)$ , which is the CDF of a Beta $(a, b)$ distribution. Which of the following is the correct identity?