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

游客2024-01-12 63

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

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I’msurelydirty,_____?A、amIB、isn’tIC、aren’tID、amnotIC“Iam+表语”这一结构的反意疑

Haveyoueverseenamovieinwhichabuildingwasburneddownorabridgewa

Peoplehavewonderedforalongtimehowtheirpersonalitiesandbehaviorsa

Accordingtothenews,peopleinmostMuslimcountries[originaltext]Arecen

当混凝土电阻率＜5000Ωcm时，可判断钢筋锈蚀的速率可能（），评定标度为（

根据氨基甲酸酯类杀虫剂的危害分级标准，属于极度危害类（Ⅰa）的为A、苯硫威

下列作品不属于19世纪意大利歌剧作曲家创作的是（）。A.《弄臣》 B.《塞

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