KA130811003    高中 / 數學   

2013/08/28 22:57

投擲一粒公正骰子四次,出現點數依序為abcd,求滿足下列條件之機率                1 a+b+c+d為偶數                                                                                              2 abc為偶數             3a<b<c<d                                                                                                                        4(a-b)(b-c)(c-d)=0                                  5(a-b)(b-c)(c-d)(d-a)=0