If n is a positive integer, is the value of b-a at least twice the value of 3n-2n?() (1)a=2n+1 and b=3n+1 (2)n=3 A.条件(1)充分,但条件(2)不充分. B.条件(2)充分,但条件(1)不充分. C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分. D.条件(1)充分,条件(...
2英语翻译if n is a positive integer,then n(n+1)(n+2) isA even only when n is oddB evne only when n is evenC odd whenever n is oddD divisible by 3 only when n is oddE divisible by 4 whenever n is even 3 英语翻译 if n is a positive integer,then n(n+1)(n+2) ...
If n is a positive integer,and if the units’digit of n2 is 6 and the units’digit of (n-1)2 is 9,the units’digit of (n+1)2 is ___. (英汉小词典 units’digit:个位数字) 相关知识点: 试题来源: 解析 试题分析:分别写出0到9平方的尾数对应情况,然后可得出n及n-1的尾数,进而可得出n...
If n is a positive integer, then which of the following must be true about (n) and (n+1)? () A. n is odd and (n+1) is even. B. n is even and (n+1) is odd. C. The product of the two terms is odd. D. The sum of the two terms is even. E. The product of the...
is the product of the first n positive integers. For example, 4!=4×3×2×1=24. If u and v are positive integers and u!=v!×56, then v could equal( ). A. 6B. 8C. 56D. 57相关知识点: 试题来源: 解析 A There are two possible values for v:1) Since 56=55×56, one p...
If n is a positive integer , and if the units ’ digit of n2is 6 and the units ’ digit of (n−1)2is 9 , the units ’ digit of (n+1)2is ___.( 英汉小词典 units ’ digit: 个位数字 ) 相关知识点: 试题来源: 解析 个位数为 0 到 9 的数的平方的个位数为: 0−−...
If n is a positive integer and the product of all the integers from 1 to n, inclusive, is divisible by 990, what is the least possible value of n? A. 8 B. 9 C. 10 D. 11 E. 12 相关知识点: 试题来源: 解析 D [解析] Arithmetic Properties of numbers For convenience, let N ...
If n is a positive integer such that n^6+206 is divisible by n^2+2, find the sum of all possible values of n.若n是正整敷,且n^6+206可被n^2+2整除,求n所有可能值之和. 相关知识点: 试题来源: 解析 32.Note that n^6+8=(n^2)^3+2^3 is divisible by n^2+2. Hence n^2+2...
题目【题目】If n is a positive integer, n! represents the product ofthe first n positive integers , For exampl,4!=4×3×2× 1. What is the value of(x-1)(x-2)×.×(x-98)(x-99) when x=50)A.49!B.(2)(49)C.(49!)^2 D.0 相关知识点: ...
解析 2^n=(1+1)^n=(pmatrix) n 0 (pmatrix)1^n+(pmatrix) n 1 (pmatrix)(1)^(n-1)(1)+⋯ +(pmatrix) n n (pmatrix)1^n=(pmatrix) n 0 (pmatrix)+(pmatrix) n 1 (pmatrix)+⋯+(pmatrix) n n (pmatrix) 反馈 收藏 ...