The learning of iFLYTEK's big language model, coupled with my own understanding of Python, finally solved the problem of permutation and combination on this ginseng with a program.
#One math problem a day# #iFLYTEK announces iFLYTEK Spark cognitive model# #Python#
This question itself is ambiguous, in the end is to determine the selection of A, and then A meets such characteristics, B and D choose not to choose uncertain, choose to meet these conditions? This answer is 60.
The answer to the teaching reference is 60, and the analysis says that this question examines permutations and combinations, and the content of the question is not covered at all.
Or is it that if A, B and C are selected, they need to meet such characteristics, and it is uncertain whether they are selected or not. This answer is 84.
As for the answer to this question on the homework help ape search question, it is all 120, which makes no sense.
