18.(5%) Suppose that the random variables X1，X2，... are independent of each other. Each of these random variables is binomially distributed with parameters 12 (which is the number of Bernoulli trials) and 0.5 (which is the successful probability per Bernoulli trial), Suppose that Find the moment generating function of Z∞. 
(A)
(B)
(C)
(D)
(E)

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統計： A(0), B(1), C(0), D(2), E(0) #2993377