问个unlock android 手机用wifi的幼稚问题# PDA - 掌中宝
S*Y
1 楼
there is a set with dup elements, e.g. { 1 1 3 3 5}
how many possible combinations of selecting 3 elements from this set?
e.g.
1 1 3
1 3 3
1 3 5
3 3 5
How to calculate?
thanks!
how many possible combinations of selecting 3 elements from this set?
e.g.
1 1 3
1 3 3
1 3 5
3 3 5
How to calculate?
thanks!