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问一道数学题 OG-12 87
A necklace is made by stringing N individual beads together in the repeating pattern red bead, green bead, white bead, blue bead, and yellow bead. If the necklace design begins with a red bead and ends with a white bead, then N could equal:
A) 16
B) 32
C) 41
D) 54
E) 68
请问这是道排列组合题吗？
OG的解释好象不是按排列组合做的，看不懂耶。请赐教！谢谢！ |
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