How many different five-digit positive integers can be formed using the digits 1

游客2024-01-12 68

问题 How many different five-digit positive integers can be formed using the digits 1, 2, 3,4, 5,6, and 7 if none of the digits can occur more than once in the integer?

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答案 2,520

解析 This example asks how many ways there are to order 5 integers chosen from a set of 7 integers. According to the counting principle above, there are(7)(6)(5)(4)(3)= 2,520 ways to do this. Note that this is equal to

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How many different five-digit positive integers can be formed using the digits 1

Gall’shypothesisoftherebeingdifferentmentalfunctionslocalizedindiffere

Somebatcaves,likehoneybeehives,haveresidentsthattakeondifferentdutie

Althoughmanyartpatronscanreadilydifferentiateagooddebenturefromanund

Althoughmanyartpatronscanreadilydifferentiateagooddebenturefromanund

TheproductoftwoconsecutivepositiveintegersCANNOTbeA、aprimenumberB、div

Theaverage(arithmeticmean)of3differentpositiveintegersisequaltothe

[img]ct_gre5image040[/img]Thefigureaboveshowsalargesquareformedbyfitti

Theintegersbetween1and100,inclusive,areputinlistAiftheyaredivisib

Ifn=pqr,wherep,q,andrarethreedifferentpositiveprimenumbers,howma

Oneintegerwillberandomlyselectedfromtheintegers11to60,inclusive.Wha

Ourtimesseemespecially______tobadideas,probablybecauseinthrowingoffth

Whileattendingahighereducationsystemoffersmanypositives,italsooff

BOOKREVIEWMarkWertman’s

[audioFiles]2021m5x/audio_ve01005j_ezflisteningxa_0117_202105[/audioFiles]

[originaltext]IntheUnitedStates,manypeopleoncelivedinlarge,two-an

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在变更申请中，应包括的内容主要有（ ） ①变更的原因 ②变更的依据 ③变

电焊软线冒烟、着火，应断开电源，用()沿电焊软线喷洒灭火。（A）泡沫灭火器

A. B.2 C. D.0

尝试之于（ ）相当于（ ）之于进步A.创造；动力 B.成功；改革 C.艰

在变更申请中，应包括的内容主要有（　　） ①变更的原因 ②变更的依据 ③变

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