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Suma de la serie factorial(n)*p^k*(1-p)^(n-k)*z*k/(factorial(k)*factorial(n-k))



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Solución

Ha introducido [src]
  oo                        
____                        
\   `                       
 \        k        n - k    
  \   n!*p *(1 - p)     *z*k
  /   ----------------------
 /         k!*(n - k)!      
/___,                       
k = 0                       
$$\sum_{k=0}^{\infty} \frac{k z p^{k} n! \left(1 - p\right)^{- k + n}}{k! \left(- k + n\right)!}$$
Sum(((((factorial(n)*p^k)*(1 - p)^(n - k))*z)*k)/((factorial(k)*factorial(n - k))), (k, 0, oo))
Respuesta [src]
              //              -1 + n                                                                                                                                       \
              ||  /      p   \                                                                                                                                             |
              ||p*|1 - ------|                                                                                                                                             |
              ||  \    -1 + p/              /   /                  |  p   |    \     /|  p   |                     \     /                 |  p   |                      \\|
              ||--------------------  for Or|And|-1 + re(n) <= -1, |------| < 1|, And||------| <= 1, -1 + re(n) > 0|, And|-1 + re(n) <= 0, |------| <= 1, -1 + re(n) > -1|||
              ||  (1 - p)*Gamma(n)          \   \                  |-1 + p|    /     \|-1 + p|                     /     \                 |-1 + p|                      //|
              ||                                                                                                                                                           |
         n    ||  oo                                                                                                                                                       |
z*(1 - p) *n!*|<____                                                                                                                                                       |
              ||\   `                                                                                                                                                      |
              || \       k        -k                                                                                                                                       |
              ||  \   k*p *(1 - p)                                                                                                                                         |
              ||  /   --------------                                                                otherwise                                                              |
              || /     k!*(n - k)!                                                                                                                                         |
              ||/___,                                                                                                                                                      |
              ||k = 0                                                                                                                                                      |
              \\                                                                                                                                                           /
$$z \left(1 - p\right)^{n} \left(\begin{cases} \frac{p \left(- \frac{p}{p - 1} + 1\right)^{n - 1}}{\left(1 - p\right) \Gamma\left(n\right)} & \text{for}\: \left(\operatorname{re}{\left(n\right)} - 1 \leq -1 \wedge \left|{\frac{p}{p - 1}}\right| < 1\right) \vee \left(\left|{\frac{p}{p - 1}}\right| \leq 1 \wedge \operatorname{re}{\left(n\right)} - 1 > 0\right) \vee \left(\operatorname{re}{\left(n\right)} - 1 \leq 0 \wedge \left|{\frac{p}{p - 1}}\right| \leq 1 \wedge \operatorname{re}{\left(n\right)} - 1 > -1\right) \\\sum_{k=0}^{\infty} \frac{k p^{k} \left(1 - p\right)^{- k}}{k! \left(- k + n\right)!} & \text{otherwise} \end{cases}\right) n!$$
z*(1 - p)^n*factorial(n)*Piecewise((p*(1 - p/(-1 + p))^(-1 + n)/((1 - p)*gamma(n)), ((-1 + re(n) <= -1)∧(Abs(p/(-1 + p)) < 1))∨((-1 + re(n) > 0)∧(Abs(p/(-1 + p)) <= 1))∨((-1 + re(n) <= 0)∧(-1 + re(n) > -1)∧(Abs(p/(-1 + p)) <= 1))), (Sum(k*p^k*(1 - p)^(-k)/(factorial(k)*factorial(n - k)), (k, 0, oo)), True))

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