How many 3-digit numbers can be composed of the digit 1,3,5,7,9, if the digits are not allowed to be repeated in the number notation? How many of them are divisible by five? 相关知识点: 试题来源: 解析 n=60m=12http://gallery.fbcontent.cn/latex?decode=false&latex=%3Cimg%20dat...
百度试题 结果1 题目How many three-digit whole numbers are there such that the digit sum is ? A. 2 B. 4 C. 6 D. 8 E. 10 相关知识点: 试题来源: 解析 E, , , , , , , , , 总共有10个 反馈 收藏
AskBobBot ProfBot I will give you the most educated answer. AskProfBot BettyBot Oh honey, believe me, I'll tell you how it is! AskBettyBot Add your answer: Earn +20pts Q:How many combinations of three digits of 0-9 will add up to 14?
How many distinct 3-digit numbers contain only nonzero digits? A. 909 B. 899 C. 789 D. 729 相关知识点: 排列组合与概率统计 计数原理 分步乘法计数原理 试题来源: 解析 D 【分析】本题考查分步计数原理,属基础题.【解答】解:由分步计数原理可知,不含0的三位数有9×9×9=729 个.故选D....
If the middle digit is the average of the first and last digits, twice the middle digit must be equal to the sum of the first and last digits. Doing some casework: If the middle digit is , possible numbers range from to . So there are numbers in this case. If the middle digit is...
How many different 3-digit numbers can you make using the numbers 1,4,5,8 only (each number can only be used once)? (2) How many different 3-digit numbers can you make using the numbers 1,4,5,8 only (each number can be used more than once)?
请解出下面这个英文问题:How many 3-digit numbers have exactly one digit 5 in them? 答案 在所有的三位数中,其中有且只有一位是5的有多少个?假设5在百位,即:5 _ _ ,剩下的两个位置可以填入0到9(除了5)的任何数,所以他们的组合有9×9=81个; 若5在十位,即:_ 5 _ ,则百位除5不能填以外,0也...
How many three-digit numbers are there that have the sum of their digits equal to 7?. 相关知识点: 试题来源: 解析 28.. First of all, we can list out the ways to rewrite 7 as the sum of three numbers: 7=0+0+7=0+1+6=0+2+5=0+3+4 =1+1+5=1+2+4=1+3+3=2+2+3 ...
百度试题 结果1 题目2. How many positive three-digit numbers are divisible by 13? B(A)68(B)699(C)70(D)76(E)77 相关知识点: 试题来源: 解析 B 反馈 收藏
【题目】How many different three-digit numbers can we make by using the digits 1, 2, and 3 without repeating digits? What is the sum of all these possible three-digit numbers? 相关知识点: 试题来源: 解析 【解析】6;1332. 反馈 收藏 ...