Since N has a Poisson distribution with mean A, we have:
$$
P(N=n|A=a) = \frac{a^n e^{-a}}{n!}
$$
And since A has a uniform distribution on the interval (0, 10), we have:
$$
P(A=a) = \frac{1}{10}
$$
Now, we can find the joint probability distribution of N and
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