Let X be a random variable with probability function:(adsbygoogle = window.adsbygoogle || []).push({});

[itex]fx(x) = c/x!, x = 0, 1, 2, ...[/itex]

Find c.

By first guess was to form the sum:

[itex]\sum_{i=0}^{x} c/i! = 1[/itex]

But I have no idea if that's the right approach or how to proceed.

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# Unknown in discrete variable problem

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