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Permutation and Combiniation

發問:

1.Each seat in the corent hall is labelled with the upper case letter followed by a positive integer 100 to 999.Using this labelling system,what is the greatest number of seats can be labelled?2.How many ways can a black, a red,a green,a blue,a yellow and a purple marble be arranged in a row if the black and the... 顯示更多 1.Each seat in the corent hall is labelled with the upper case letter followed by a positive integer 100 to 999.Using this labelling system,what is the greatest number of seats can be labelled? 2.How many ways can a black, a red,a green,a blue,a yellow and a purple marble be arranged in a row if the black and the purple marbles must be placed at the two ends of the row? 3.if 4 fair dice are thrown,find the number of outcomes which have at least one"6"?

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