对于现行高中数学教材(人教版)必修3第125页的例1[1]:从字母a,b,c,d中任意取出两个不同的字母的实验中,有哪些基本事件?教材所给出的解答是:所求的基本事件共有6个:A={a,b},B={a,c},C={a,d},D={b,c},E={b,d},F={c,d}.显然,教材是按照“组合”的理解来解答的,这是无可非议的.事实上,例1只是要求“任意取出两个不同的字母”进行实验,并未要求把抽出字母进行排序,基本事件的构成自 For existing high school math textbooks (PEP) compulsory 3 on page 125 of Example 1 [1]: from the letters a, b, c, d arbitrary take out two different letters in the experiment, what are the basic events? The answer given is: There are 6 basic events to be solved: A = {a, b}, B = {a, c}, C = {a, d}, D = {b, c} Obviously, the teaching material is answered in the light of the “combination.” In fact, Example 1 simply requires that “any two different letters be removed ”Experiment, did not require to sort out the letters, the basic composition of events from