四位正整数的千位和百位数字相同,十位和个位数字相同,设这个四位数为, 即千位,百位,十位,个位上的数字分别为,,,且,, 当时,的取值可以为到的整数,则有种取值; 当时,的取值可以为到的整数,则有种取值; 当时,的取值可以为到的整数,则有种取值; 所以有种不同的结果, 故有个四位正整数的千位和百位相同,且...
How many four-digit positive integers are there with thousands digit 答案 问题是【4位数的正整数中有多少个的千位数是2的?】答:2000到2999之间的数字都符合条件,所以共有2999-2000+1=1000个,即【one thousand integers.】相关推荐 1How many four-digit positive integers are there with thousands digit 反...
[练习]排列与组合 Time cost 00:01 Location 1 of 15 纠错 收藏 设置 How many 4-digit positive integers are there in which all 4 digits are even? 625 600 500 400 256 Help Quit Pause Next
How many integers less than 400 can be formed using the digits 2, 3, 4, 5 and 6 without repetition? How many whole numbers less than 100000 contain all digits 0, 2, 4, 6, 8? How many 3 digit numbers can be made from the digits 1,...
1.几个小立方体黏在一起成一个大立方体6个面被涂成红色,if exactly 27 of small cubic blocks that make up the large cube have no paint on them ,how many cubic blocks make up the large cube?125} 2.in a sequence of nmbers,the first number is2and each number is 2 more than 3 times ...
【题目】有多少个四位正整数的四个数字依次组成一个等差数列(例如:1357、5678)?How many four-digit positive integers are there such that the four digits form an arithmetic sequence in t hat order ( e.g. 1357,5678)? 相关知识点: 试题来源: ...
(注:0是平方数.)How many four-digit positive integers are there such that each of its digits is a square number? (Note: 0 is a square number.). 答案 192.. 个位数的平方数有0,1,4,9这4个,这个四位正整数的千位数只能为1,4,9,当这个四位正整数的千位数为1时,百位数可能为0,1,4,9...
How many three-digit positive integers are there such that the three digits are 3, 4, and 8 ? 3 6 9 15 96So, you were trying to be a good test taker and practice for the GRE with PowerPrep online. Buuuut then you had some questions about the quant section—specifically question 8 ...
How many three-digit positive integers are there such that the three digits are 3, 4, and 8 ? A.3 B.6 C.9 D.15 E.96 显示答案 登录后才可以添加做题笔记哦,还没有账号? 马上注册 KMF 解析 网友解析 题目数据 收起 暂无解析 以上解析由 考满分老师提供。 题目讨论 已经输入 0 个...
How many 3-digit positive integers are there whose middle digit is equal to the sum of the first and last digits? How many positive three-digit numbers can be made from the digits 4, 5, 6, and 7 if no digit can be used more than once in a given number?