今彩539彩券的數學機率與期望值 C(39,5)=(39x38x37x36x35)/(5x4x3x2x1)=575757中頭獎機率= C(已開5,取5)xC(未開34,取0) / 575757 = 1 / 575757中4號機率= C(已開5, ...
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