Question

從52張撲克牌中隨機(jī)抽取5張,試求下列事件的概率:

(1)五張牌同一花色;

(2)恰好有兩張點(diǎn)數(shù)相同而另三張點(diǎn)數(shù)不同;

(3)恰好有兩個(gè)兩張點(diǎn)數(shù)相同而另一張是另外的點(diǎn)數(shù);

(4)恰好有三張點(diǎn)數(shù)相同而另兩張點(diǎn)數(shù)不同;

(5)恰好有四張點(diǎn)數(shù)相同.

Answer 1

解:試驗(yàn)結(jié)果共有n=種.

(1)五張牌同一花色的事件個(gè)數(shù)m=4,

∴P(A)===0.002 0.

(2)m=···4·4·4=···4³,

∴P(B)===0.422 6.

(3)m=····，∴P(C)= ==0.047 5.

(4)m=,∴P(D)==0.021 1.

(5)m=,

∴P(E)==0.000 25.