List A, B and C means the list of multiples of prime numbers 2, 3, and 5 respect

游客2024-01-12 29

问题 List A, B and C means the list of multiples of prime numbers 2, 3, and 5 respectively, how many integers between 1 and 100, inclusive, will apper on all three of the lists?

选项 A、None
B、l
C、3
D、5
E、An infinite number of integers

答案 C

解析如果这个数出现在三个List中，那么它必然是2，3，5的倍数，因此只要求出1到100有多少个数能够同时整除2，3，5，这三个质数的最小公倍数为2×3×5=30，100=30×3+10，因此有3个能够同时整除2，3，5，所以选择C。

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List A, B and C means the list of multiples of prime numbers 2, 3, and 5 respect

Iffandgaredistinctprimenumberslessthan10,whichofthefollowingcanno

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Foranynumbersaandb,ab=ab(3-b).Ifaandabbothrepresentpositivenumbers

ListA,BandCmeansthelistofmultiplesofprimenumbers2,3,and5respect

Sixdifferentnumbersaretobeselectedfromthe(0,1,2,3,4,5,6)tocompos

Eachof5positivewholenumbersisatleast8.Theaverage(arithmeticmean)oft

Thenumbersinthelistaboveareorderedfromleasttogreatest.Ifthemedian

Alisthas100numbers,theexpectationofthelistis10andthestandarddevia

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