How many ways can you rearrange the letters in the word GEOMETRY to be a new “word”? How many ways can you rearrange the letters in {G,E,O, M, E, T, R, Y} to be a new “word”? 这两个问法其实一样,但是第一个就会引起歧义
LZ is correct. Just look at a much simpler case: How many ways can you rearrange the letters in the word AM to be a new “word”? Answer: 1 (which you get from 2! -1)
sweetyam 发表于 2025-04-30 21:23 How many ways can you rearrange the letters in the word GEOMETRY to be a new “word”? 答案是8!/ 2!。我认为应该再减掉1,可是找了所有网上的类似题目都没有减1。
答案是8!/ 2!。我认为应该再减掉1,可是找了所有网上的类似题目都没有减1。
他意思是减去已经给出的word,所以减1。
这是文科思维
How many ways can you rearrange the letters in {G,E,O, M, E, T, R, Y} to be a new “word”?
这两个问法其实一样,但是第一个就会引起歧义
Just look at a much simpler case:
How many ways can you rearrange the letters in the word AM to be a new “word”?
Answer: 1 (which you get from 2! -1)
这种写清楚就好了
由于题目不清导致的答案不一致
其它地方的答案全部统一就好办了,随大流。你女儿是对的,数学知识已经学到了,没必要死磕题目描述的解读。