There will be as many ways as there are ways of filling 3 vacant places in succession by the given six digits.In this case, the units place can be filled by 2 or 4 or 6 only i.e., the units place can be filled in 3 ways.The tens place can be filled by any of the 6 digits...
百度试题 结果1 题目How many 3 digits numbers have exactly one digit 5 in them?ji 相关知识点: 试题来源: 解析 既然是3位数字,那么考虑区间就是100-999情况1,有一个5:9*9=81个情况2,有两个5:9+9=18个情况3,有三个5:1个总共:100个 反馈 收藏 ...
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...
67.How many3-digit numbers satisfy(满足)the property that the middle digit is the average of thefirst and the last digits?((A)42(B)43(C)44(D)4567.How many 3-digit numbers satisfy(满足)the property that the middle digit is the average of the first and the last digits? () (A)42...
How many three-digit numbers can be made using the digits 0, 1, 2, 3, 4, and 5? How many four-digit numbers can be made without repeating digits?How many five-digit numbers can be made using the digits 0, 1, 2, 3, 4, 5, and 6 without repeating digits?
How many four-digit numbers can be made without repeating digits?How many five-digit numbers can be made using the digits 0, 1, 2, 3, 4, 5, and 6 withoutrepeating digits? 3【题目】Answer the following questions:How many three-digit numbers can be made wsing the digits o, 1, 2, ...
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...
结果一 题目 How many 3-digit numbers are divisible by 答案 意思大概是,有多少个能被7整除的3位数,共128个,做法是,最小能被7整除的三位数是105,最大994,从105到994共890个数字,除以7等于127余点东西,所以是128个 相关推荐 1 How many 3-digit numbers are divisible by ...
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
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)?