      \fitem{rnd_binomial}($t$:int, $p$:float) returns a random generator
      that produces integers according to a \emph{binomial discrete
        distribution} $P$:
      $$
      P(i, | t, p) = \binom{t}{i} \, p^i \, (1 - p)^{t-i}, \quad i \geq 0.
      $$



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