Ononot — Consider a discrete random variable X that can take values \

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Consider a discrete random variable $X$ that can take values $\{1, 2, 3, 4\}$ with the following probability mass function (PMF): $P(X=k) = c \cdot k$ for $k \in \{1, 2, 3, 4\}$ . What is the value of $c$ ?