作业帮求一道SAT数学题In the figure above,three sires are braided.That is
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求一道SAT数学题
In the figure above,three sires are braided.That is,by sarting in the order A,B,C,the outer left wire A is brought over wire B to the middle position,forming the order to the new middle position position shown in step 2,and so on,alternately bringing each new left and each new right wire to the middle.At that numbered step does the braid first repeat the original order A B C.
In the figure above,three sires are braided.That is,by sarting in the order A,B,C,the outer left wire A is brought over wire B to the middle position,forming the order to the new middle position position shown in step 2,and so on,alternately bringing each new left and each new right wire to the middle.At that numbered step does the braid first repeat the original order A B C.
题干不是给出了前2步
START ABC
STEP1 BAC
STEP2 BCA
那么以此类推,按照上面的顺序换CB的位置（一次置换两根绳之间的位置,你只要看是发生在一二还是二三之间就好）
STEP3 CBA
STEP4 CAB
STEP5 ACB
STEP6 ABC
所以就是答案D喽,第六步
START ABC
STEP1 BAC
STEP2 BCA
那么以此类推,按照上面的顺序换CB的位置（一次置换两根绳之间的位置,你只要看是发生在一二还是二三之间就好）
STEP3 CBA
STEP4 CAB
STEP5 ACB
STEP6 ABC
所以就是答案D喽,第六步
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