Joan's compact disc player has a setting called"random" that plays the songs on a particular compact disc in any random order. If she is playing a compact disc with 7 songs, what is the probability that the order of the songs will be the exact same order as the order given on the compact disc(1-7)
well, this isn't written very easy to undersatand, does it mean the probability that the order of the songs will be exact same order as 1 to 7? or the probability of the arrangement of different orders? please explain its cannotation to me! in fact, is very bad writing in my opion.
2007-01-31 18:17:53 · 3 answers · asked by liangjizong22 1 in Science & Mathematics ➔ Mathematics
See, there are 7! ways that songs are arranged in the compact disk
but u want them in a specific order
so, probability is 1/7!=1/5040
2007-01-31 18:54:03 · answer #1 · answered by Pradeep Chelani 2 · 0⤊ 0⤋
its asking what is the probability that first number 1 will be played, then number 2, then number 3, then number 4, and then 5, and then 6, and then 7.
2007-02-01 02:20:48 · answer #2 · answered by christina rose 4 · 0⤊ 0⤋
there is only one way to play the songs in proper order. How many other orders are there that they can be played in. Remember that each numeral is available in each position.
the probability is the ratio between these two numbers
2007-02-01 02:30:08 · answer #3 · answered by U-98 6 · 0⤊ 1⤋