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There will be seven performers in a talent show: a guitarist, a hypnotist, a juggler, a magician, a pianist, a singer, and a ventriloquist. Exactly three of the performers—the guitarist, the pianist, and the singer—will each require a recorded musical accompaniment. The schedule for the show has seven consecutive time slots. Each of the seven performers will appear in exactly one time slot, and each time slot will have exactly one performer appearing in it. The schedule must follow the rules below:
The juggler must appear first.
The ventriloquist cannot appear immediately after the magician.
At most two performers requiring a recorded musical accompaniment can appear in succession.
Which of the following is an acceptable schedule for the last four performers in the show?
Fourth Fifth Sixth Seventh
Juggler Hypnotist Guitarist Pianist
Guitarist Magician Ventriloquist Singer
Magician Pianist Singer Guitarist
Singer Guitarist Pianist Hypnotist
Ventriloquist Hypnotist Magician Singer
答案:(E)
这是一道非常简单的排列题,但是分析题在于你会不会做,而在于你花了几分钟把它做完,在于速度。我们通过讲解几道题来体会一下如何迅速定位答案。
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