given a collection of 2n objects,n of which are identical and n of which are all distinct,howmany different subcollection of n objects are possible?有一系列2N的东西 N个事一样的 N个事不一样的 有多少个集合? 答案
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given a collection of 2n objects,n of which are identical and n of which are all distinct,how
many different subcollection of n objects are possible?有一系列2N的东西 N个事一样的 N个事不一样的 有多少个集合? 答案是NC0+ Nc1 + ......+Ncn
如果该集合中只有一个,那么就有N+1个集合,如果有两个,则有两种1是在n个一样的中选一个和不一样的中选一个,则有n中,2,就是两个全是不一样的,就只有在那N个不一样的东西中选择,就有C20,2,如果有三个,也有两种,一是在不一样中的选择两个,一样的一个,就有C20,2种,第二就是全在不一样事物中选择3个,就有C20,3种,以此类推,就会得到答案的、谢谢,
a collection of
show that,given any sequence of n integers,x1,x2,x3.xn some consecutive collection has a sum dividible by n
a given
COLLECTION
collection
a books collection 和a book collection哪个对
a small sports collection 侞题~
a great sports collection是什么意思?
I have a sports collection
They have a great collection.
a matter/waste/collection of
a ball collection什么意思?
英文翻译3Quality control (QC) is the collection of methods and techniques for ensuring that a product or service is produced and delivered according to given requirements. This includes the development of specifications and standards, performance
翻译:Ed has a great sports collection.
a great sports collection什么意思?
have a sports collection的汉语意思
He have a great sports collection.改错
Ed Smith has a great sports collection.