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这几道题都是关于数学哪方面知识的?1.Anurncontainssixred,threewhite,andtwobluemarbles.Inhowmanywayscanthreemarblesbeselectedsothatatleastoneisblue?2.Amanhasapenny,anickel,adime,aquarter,andahalf-dollarco
更新时间: 2025-08-28 10:09:51
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这几道题都是关于数学哪方面知识的?

1.Anurncontainssixred,threewhite,andtwobluemarbles.Inhowmanywayscanthreemarblesbeselectedsothatatleastoneisblue?

2.Amanhasapenny,anickel,adime,aquarter,andahalf-dollarcoininhispocket.Themanreachesintohispocketandselectsthreecoins.Howmanydifferentsumscanhethreecoinsform?

3.Fivecardsaredrawnfromastandarddeckof52cards.Howmanydifferenthandsoffivecardscontainfourofakind(fourcardsofthesamerankplusoneadditionalcard)?

4.Anicecreamstorehas31flavorstoselectfrom.Acustomerwantstoselecttwodifferentflavors.Howmanywayscanthecustomermakethisselection?

5.Asetcontainsfiveelements.Howmanysubetscanbeformedfromtheset?

陈再峰回答:
  1.27/55   2.$0.31$0.56$0.76$0.8   3.4165   4.465   5.120
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