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,...
Let x,y and z be elements of {1,2,3,...}. How many solutions to the equation: x + y + z = 21? How many relations are there on a set with n elements? How many 4-element subsets of the set S = \{1,2,3...,10\} contain no consecutive integers?
How many 4-element subsets of the set S = \{1,2,3...,10\} contain no consecutive integers? How many relations are there on a set with n elements? How many subsets of s = {1, 2, 3, 4, 5, 6, 7, 8} have either 5, 6 or 7 as their larges...
Thepower setof a setAis the collection of all subsets of A. When working with a finitesetwithnelements, one question that we might ask is, “How many elements are there in the power set ofA?” We will see that the answer to this question is 2nand prove mathematically why this is true...
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 {4,6,8,9}, which is just 24=16. The number of subsets with atleast ...
so that the mean (average) of the remaining numbers is?( ) A: B: C: D: E: 相关知识点: 试题来源: 解析 D 翻译:从集合,,,中去掉两个数,使得剩下所有数字的平均数是,一共有( )多少种方法? 个数中去掉两个数剩下个数,平均数是,总和,原总和是,所以,是去掉两数的总和,共五种.反馈 收藏 ...
Let S be a set containing n elements. Show that S has 2n subsets. How many different relations are there on a set with n elements if (a) n = 1. (b) n = 2. (c) n = 3. How many anti-symmetric relations on the set A = {1,2,3,4,5,6} contain the order...
If a set has 1,024 subsets, how many elements does it have? Given that the set A = (5, 6, 7, 8, 9), how many subsets of A contain at least 2 elements? How many subsets in a set with n elements have n elements? How many subsets of the set {1, 2, 3, 4, 5, 6, 7,...
How many subsets of the set {1,2,3,4,5,6,7,8,9,10} contain the number 5? Evaluating the Given Subset:The subset is a set such that all of its elements are contained in another set. Given a set, then there are two possibilities for each element - the ...