✔ 最佳答案
您與
http://hk.knowledge.yahoo.com/question/?qid=7007123101638所問的問題一樣啊!
不過不要緊,我還是再答多次吧!
圖片參考:
http://hk.yimg.com/i/icon/16/10.gif
1.
a)P(2張方塊和1張黑桃A)=13x13x1x3/52x52x52
=3/832
b)P(1張方塊,1張紅色牌和一張A)=13x26x4x2x3/52x52x52
=3/52
c)P(1張方塊和2張紅色牌)=13x26x26x3/52x52x52
=3/16
2.
a)P(2張紅心和1個正面)=13x13x1/52x52x2
=1/32
b)P(2張A和1個反面)=4x4x1/52x52x2
=1/338
c)P(1張黑桃,一張A和1個正面)=13x4x1/52x52x2
=1/104
d)P(2張A,不是正面或反面)=4x4x0/52x52x2
=0
3.
a)P(首先P,接著R,最後S)=2x1x3/6x5x4
=1/20
b)P(首先P,接著P,最後R)=2x1x1/6x5x4
=1/60
c)P(首先R,接著S,最後S)=1x3x2/6x5x4
=1/20
d)P(首先S,接著P,最後S)=3x2x2/6x5x4
=1/20
e)P(全部都是S)=3x2x1/6x5x4
=1/20
4.
a)P(首先紅波,接著藍波,最後白波)=4x3x2/9x8x7
=1/21
b)P(首先紅波,接著紅波,最後藍波)=4x3x3/9x8x7
=1/14
c)P(首先藍波,接著藍波,最後白波)=3x2x2/9x8x7
=1/42
d)P(全部都是紅波)=4x3x2/9x8x7
=1/21
e)P(全部都是藍波)=3x2x1/9x8x7
=1/84
有任何不明白,歡迎傳送電郵給我,我樂意為您解答!
圖片參考:
http://hk.yimg.com/i/icon/16/25.gif