Let XXX be the number of heads in 2 fair coin flips. What is MX(t)M_X(t)MX(t)?
14+12et+14e2t\frac{1}{4} + \frac{1}{2}e^t + \frac{1}{4}e^{2t}41+21et+41e2t
(0.5+0.5et)2(0.5 + 0.5e^t)^2(0.5+0.5et)2
0.25(1+et)20.25(1+e^t)^20.25(1+et)2
All of the above