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、...
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
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
A box contains 90 discs which are numbered from 1 to 90. If one discs is drawn at random from the box, find the probability that it bears (i) a two digi
If x and y are different prime numbers, each greater than 2, which of the following must betrue? I II x - y is an even integer. III is not an integer._老师,这里没有说x>y,为什么第二个一定对?存在x-y是负数的情况么?这样不就不是偶数了?奇偶不
百度试题 结果1 题目(UK EPP 11+ Maths Grammar School Paper 14, Q39)Which two numbers are prime numbers?A.89 and 87B.89 and 83C.87 and 83D.87 and 81E.83 and 81 相关知识点: 试题来源: 解析 B 反馈 收藏
百度试题 结果1 题目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....
A box contains 90 discs which are numbered from 1 to 90. If one disc is drawn at random from the box, find the probability that it bears (i) a two-digit numbe
Which of the following numbers are prime?51Solution in Punjabi Video SolutionStruggling With Playing With Nu...? Get Allen’s Free Revision Notes Free ALLEN Notes | ShareSave Answer Step by step video & image solution for Which of the following numbers are prime?51 by Maths experts to help ...
On prime numbers, for which (almost) all fermat numbers are quadratic non-residuesIt is well known that 3, 5, 7 are such primes. But in higher regions they appear only very rare. There exist many residue classes without such primes. Also other conditions for their existence are given. ...