百度试题 结果1 题目How many subsets does a set with n elements have? A. n B. 2^n C. n! D. 2n 相关知识点: 试题来源: 解析 b 反馈 收藏
The subsets of a set having {eq}n {/eq} elements give us sets that contain one element of the set up to all the elements of the set. The number of subsets of a set having {eq}n {/eq} elements is quickly computed as {eq}2^n {/eq}....
How many subsets of two elements can be removed from the set {1,2,3,4,5,6,7,8,9,10,11} so that the mean(average) of the nine remaining numbers is 6?( )在集合{1,2,3,4,5,6,7,8,9,10,11}中,有多少个含有两个元素的子集可以被移除,使得剩余九个数字的均值(平均数)是6?( ) ...
A. 1 B. 2 C. 3 D. 5 E. 6 相关知识点: 试题来源: 解析 D 翻译:从集合{1,2,3,4,5,6,7,8,9,10,11}中去掉两个数,使得剩下所有数字的平均数是6,一共有( )多少种方法? 11个数中去掉两个数剩下9个数,平均数是6,总和6×9=54,原总和是1+2+⋯+11=66,所以66−54=12,12是去掉...
How many subsets of two elements can be removed from the set {1,2,3,4,5,6,7,8,9,10,11} so that the mean (average)of the remaining numbers is ?( ). A. 1 B. 2 C. 3 D. 5 E. 6 相关知识点: 试题来源: 解析 D 有多少个二元子集,使之从{1,2,3,4,5,6,7,8,9,10,...
【题目】How many subsets of two elements can be removed from the set {1,2,3,4,5,6,7,8,9,10, 11} so that the mean (average) of the remaining numbers is ?().A1B.2C.3D.5E6 相关知识点: 试题来源: 解析 【解析】D 反馈 收藏 ...
1How many subsets containing three different numbers can be selected from the set so that the sum of the three numbers is even?( ).A.6B.8C.10D.12E.24 2How many subsets containing three different numbers can be selected from the set {89,95,99,132,166,173} so that the sum of the...
A.128 B.192 C.224 D.240 E.256相关知识点: 试题来源: 解析 D Consider finding the number of subsets that do not contain any primes.There are four primes in the set:2, 3, 5, and 7.This means that the number of subsets without any primes is the number of subsets of {4,6,8...
【题目】How many subsets containing three different numbers can be selected from the set {89,95,99,132, 166,173}so that the sum of the three numbers is even?(A.6B.8C.10D.12E24 相关知识点: 试题来源: 解析 【解析】D 反馈 收藏
Consider finding the number of subsets that do not contain any primes.There are four primes in the set:, , , and .This means that the number of subsets without any primes is the number of subsets of , which is just . The number of subsets with at least one prime is the number of ...