a)How many cards must be selected from a standard deck of 52 cards to guarantee that at least three cards of the same suit are chosen?b)How many must be selected to guarantee that at least three hearts are selected?

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a)How many cards must be selected from a standard deck of 52 cards to guarantee that at least three cards of the same suit are chosen?b)How many must be selected to guarantee that at least three hearts are selected?
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a)How many cards must be selected from a standard deck of 52 cards to guarantee that at least three cards of the same suit are chosen?b)How many must be selected to guarantee that at least three hearts are selected?
a)How many cards must be selected from a standard deck of 52 cards to guarantee that at least three cards of the same suit are chosen?
b)How many must be selected to guarantee that at least three hearts are selected?

a)How many cards must be selected from a standard deck of 52 cards to guarantee that at least three cards of the same suit are chosen?b)How many must be selected to guarantee that at least three hearts are selected?
抽屉原理及最差原则
建立抽屉,4种花色看做4个抽屉,考虑最差情况:
(1)前8张,每种花色各两张
那么再抽出任意一张,前面8张中肯定与这张花色相同
即至少要抽出8+1=9张
(2)黑桃占13张,红桃占13张,其余的占26张,所以至少要取26+3=29张

用how many提问Sandy has got 2 birthday cards. how many people send cards by email,because it's much a.nearer b.shorter c.quicker d.farther thisway a)How many cards must be selected from a standard deck of 52 cards to guarantee that at least three cards of the same suit are chosen?b)How many must be selected to guarantee that at least three hearts are selected? 一道用英语表达的数学应用题!jaspar has 37 baseball cards.if he gets 11 more cards,he will have exactly half as many cards as his friends,tom .how many cards does tom have? 改成同义句 1)Does he have any cards 2)How many pens do you have 排列英语顺序A.Why do you like music?B.What's your favourite subiect?C.How many music classes do you have in a week?D.Do you like her?F.I have only one in a week.G.Who's your music teacher?H.Mrs Lee.I.Yes.We love to listen to her carefully.J.Mus how many cards did he buyon the last day?意思加回答,加5~急.快how many cards did he buyon the last day?意思和回答,加5~ kindsof,many,shop,are,cards,there,a,in,gift.连词成句 ..我英语一塌糊涂,一、 单项选择 (共15题,每小题1分,满分15分)( )1.I think _________ is _________ great fun.A.play the cards,a B.play cards; /C.playing cards the cards ; a C.playing cards; /( ) 2.Chinese _________ in many countr 1、There are many people in the park,some are playing cards,some are dancing,and ____ are taking awalk.A.other peoples B.the others C.others D.the other people2、——How many monkeys are there in the cage left?——______A.None B.No one C.Nothin He has sent many cards to his friends. many cards划线提问 ____ are the apples?a.How many b.How much c.how many money how many classes do you have a How many sides does a house have? how many sides does a house has? How many months make a year? how many sides does a houes have How many sides does a circle have?