Question

数学概率怎么算来的:C 2/4C2/4—2=34 这数咋算出来的

Answer 1

C 2/4C2/4—2=34
应该是 (C右上2右下4)*(C右上2右下4)—2=34
一般写成:
C(4,2)*C(4,2)-2
=(4*3/(1*2))*(4*3/(1*2))-2
=6*6-2
=36-2
=34