P(x)=e−mmxx!,x=0,1,2,…,nP(x)=\frac{e^{-m} m^{x}}{x !}, x=0,1,2, \ldots, nP(x)=x!e−mmx,x=0,1,2,…,n
P(x)=e−mmxx!,x=0,1;2,…,∞P(x)=\frac{e^{-m} m^{x}}{x !}, x=0,1 ; 2, \ldots, \inftyP(x)=x!e−mmx,x=0,1;2,…,∞
P(x)=e−xxmx!,x=0,1,2,…,nP(x)=\frac{e^{-x} x^{m}}{x !}, x=0,1,2, \ldots, nP(x)=x!e−xxm,x=0,1,2,…,n
P(x)=e−xmxm!,x=0,1,2,…,∞P(x)=\frac{e^{-x} m^{x}}{m !}, x=0,1,2, \ldots, \inftyP(x)=m!e−xmx,x=0,1,2,…,∞
