✔ 最佳答案
圖片參考:
https://s.yimg.com/rk/HA00430218/o/475640911.jpg
(a)
P(2 或 4)
= P(2) + P(4)
= 1/6 + 1/6
= 2/6
= 1/3
(b)
P(質數)
= P(2 或 3 或 5)
= P(2) + P(3) + P(5)
= 1/6 + 1/6 + 1/6
= 3/6
= 1/2
(c)
P(奇數 或 2)
= P(奇數)+ P(2) - P(奇數 及 2)
= P(奇數)+ P(2) - 0
= P(奇數)+ P(2)
= P(1 或 3 或 5)+ P(2)
= P(1) + P(3) + P(5) + P(2)
= 1/6 + 1/6 + 1/6 + 1/6
= 4/6
= 2/3