Which of the following numbers is a prime number? A. 12 B. 15 C. 17 D. 18 相关知识点: 试题来源: 解析 C。本题考查质数的概念。质数是指一个大于 1 的自然数,除了 1 和它自身外,不能被其他自然数整除的数。12 可以被 2、3、4、6 整除;15 可以被 3、5 整除;18 可以被 2、3、6、...
A prime number is a positive integer having exactly two factors. If p is a prime, then the only factors it can have are 1 and p. Any number that does not fall into this category is said to as a composite number, meaning it may be factored into other posi
百度试题 结果1 题目Is prime?Which of the following numbers are prime?21,11,18,25x=11 相关知识点: 试题来源: 解析 x=11Step-by-step explanation:21 =3·718=3·625=5·5x = 11 反馈 收藏
Which one of the following numbers is a prime number?( ) A.111 B.113 C.117 D.119相关知识点: 试题来源: 解析 B 111=3×37,117=3×39,119=7×17;therefore111, 117 and 119 are all composite numbers; only 113 is a prime number.反馈 收藏 ...
Which of the following numbers is prime View Solution Exams IIT JEE NEET UP Board Bihar Board CBSE Free Textbook Solutions KC Sinha Solutions for Maths Cengage Solutions for Maths DC Pandey Solutions for Physics HC Verma Solutions for Physics ...
百度试题 结果1 题目Which of the whole numbers 15, 23, 51, and 59 are prime numbers?相关知识点: 试题来源: 解析 23 and 59.反馈 收藏
相关知识点: 试题来源: 解析 E Prime numbers are whole numbers that have exactly two different factors. Of the answer choices:-5 is not a whole number.0 has many factors.1 has only one factor.51=(1)(52)=(3)(17)反馈 收藏
If p and r are prime numbers,which of the following must also be prime A. pr B. p+rC. pr+1 D. p2+r2E. None of the above 相关知识点: 试题来源: 解析E 若p和r是质数(prime number),则下面哪一个也一定是质数 此题可用排除法。质数就是除了1和它本身之外,没有其他因子的数,因此(A)...
to make a prime number which is less than 100. How many different prime numbers can she make? List out all the numbers.相关知识点: 试题来源: 解析 3; 7; 11; 13; 17; 19; 31; 37; 71; 73; 79; 97 Using these 4 numbers, we can make 20 different numbers which are less than 1...
答案 E [解析] 此题应该采用排除法:5=2+3,9=7+2;13=11+2;16=3+13最后发现只有23不能分解成两个质数的和。相关推荐 1If x and y are prime numbers, which of the following CANNOT be the sum of x and y ?() A.5 B.9 C.13 D.16 E.23 反馈 收藏 ...