扑克牌概率问题

a:4/C4~52 =0.00000246252347092683
B 4*8/C4~52 =0.0000221627112383
C 13*48/C4~52 =0.0015366146458583
d 13*4*12*6/C4~52 =0.0138295318127251

e 4*C4~13/C4~52 = 0.0105642256902761
f 9*4^5/C4~52 =0.0340419244620925

时间有限,选升仔一个回桥笑碧答

b.4种花色,每种敏举有8种小同花顺
P=4*8/C(52,5)

a) 20*4*3*2*(1/52)*(1/51)*(1/50)*(1/49)*(1/48)=0.0000015390
b) 32*16*12*8*4*(1/敬郑陵52)*(1/51)*(1/50)*(1/49)*(1/48)=0.000630
c) 5*52*3*2*48*(1/52)*(1/51)*(1/50)*(1/49)*(1/48) =0.000240
d) 10*52*4*3*48*3*(1/52)*(1/51)*(1/50)*12*6*(1/亮戚49)*(1/48)=0.00288
e) 52*12*11*10*9*(1/丛纤52)*(1/51)*(1/50)*(1/49)*(1/48)=0.00198
f) 10*52*16*12*8*4*(1/52)*(1/51)*(1/50)*(1/49)*(1/48)=0.0102