What is the total number of different 5-digit numbers that contain all of the di

游客2025-02-24 49

问题 What is the total number of different 5-digit numbers that contain all of the digits 2,3, 4, 7 and 9 and in which none of the odd digits occur next to each other?

选项 A、12
B、10
C、8
D、6
E、1

答案 A

解析含有2，3，4，7和9这5个不同数字，且奇数不相邻的5位数(5-digit numbers)的总数是多少?
解：本题的正确答案是(A)。这5个数中有三个奇数，不相邻时它们应分别在个位，百位和万位，剩下2，4在十位和千位，由题意可得：

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What is the total number of different 5-digit numbers that contain all of the di

TenyearsagothenumberoftaxpayersinGreenspaceCountywasslightlygreater

PhishCorunsanumberoffarmsinthearidprovinceofNufa,dependinglargelyo

ThedrymountainrangesofthewesternUnitedStatescontainrocksdatingback4

ThedrymountainrangesofthewesternUnitedStatescontainrocksdatingback4

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Acertainjarcontains100jellybeans:50white,30green,10yellow,5red,4

TheproductoftwoconsecutivepositiveintegersCANNOTbeA、aprimenumberB、div

[img]ct_2image026[/img]Ifyisatwo-digitnumberwithtensdigittandunitsd

Whichofthefollowingnumbersisbothafactorof48andamultipleof6?A、2B

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Manyyearsago,whenIwasfreshoutofschoolandworkinginDenver,Iwas

Labelthemapbelow.Writethecorrectletter,A-H,nexttoquestions16-20.[im

Thoughthepromiseofawinterbreakattheendofitmight______thephysicalco

[originaltext]W:Weallknowthatthereisanundergroundcave,asmallcavewh

二灰基层洒水养生时，应使喷出的水成雾状，不得将水直接喷射或冲击二灰碎石基层表面，

急性肾小球肾炎患儿恢复正常活动的标准是A.尿常规正常 B.血沉正常 C.血压

基金年度报告在会计年度结束后（）日内经过审计后予以公告。A.15 B.3

硫脲类药物最常见的不良反应是A:过敏反应 B:胃肠道反应 C:凝血功能障碍

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