更多"If n is a positive integer, is the "的相关试题:
[单项选择]If n is a positive integer and n2 is divisible by 72, then the largest positive integer that must divide n is ？（）
A. 6
B. 12
C. 24
D. 36
E. 48
[单项选择]
For any positive integer n, n＞1, the "length" of n is the number of positive primes (not necessarily distinct) whose product is n. For example, the length of 50 is 3 since 50=(2)(5)(5)
Which of the following integers has length 3 ？（）
A. 3
B. 15
C. 60
D. 64
E. 105
[单项选择]When 10 is divided by the positive integer n, the remainder is n-4. Which of the following could be the value of n ？（）
A. 3
B. 4
C. 7
D. 8
E. 12
[单项选择]If n is a positive integer, then n(n+1)(n+2) is （）.
A. even only when n is even
B. even only when n is odd
C. odd whenever n is odd
D. divisible by 3 only when n is odd
E. divisible by 4 whenever n is even
[单项选择]If n is a positive integer and k+2=3n, which of the following could NOT be a value of K ？（）
A. 1
B. 4
C. 7
D. 25
E. 79
[单项选择]If n is a positive integer and k=5.1×10n, what is the value of k ？（）
(1)6,000＜k＜500,000
(2)k2=2.601×109
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）也充分.
E. 条件（1）和条件（2）单独都不充分，条件（1）和条件（2）联合起来也不充分.
[单项选择]
What is the remainder when the positive integer x is divided by 2 ？（）
(1)x is an odd integer.
(2)x is a multiple of 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）也充分.
E. 条件（1）和条件（2）单独都不充分，条件（1）和条件（2）联合起来也不充分.
[单项选择]
What is the least positive integer that is divisible by each of the integers 1 through 7, inclusive ？（）
A. 420
B. 840
C. 1，260
D. 2，520
E. 5，040
[单项选择]Can the positive integer p be expressed as the product of two integers, each of which is greater than 1 ？（）
(1)31＜p＜37
(2)p is odd
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）也充分.
E. 条件（1）和条件（2）单独都不充分，条件（1）和条件（2）联合起来也不充分.
[单项选择]What is the tens digit of positive integer x ？（）
(1)x divided by 100 has a remainder of 30.
(2)x divided by 110 has a remainder of 30.
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）也充分.
E. 条件（1）和条件（2）单独都不充分，条件（1）和条件（2）联合起来也不充分.
[单项选择]
If a is a positive integer, and if the units’ digit of a2 is 9 and the units’ digit of (a+1)2 is 4, what is the units’ digit of (a+2)2 ？（）
A. 1
B. 3
C. 5
D. 7
E. 9
[单项选择]Is the positive integer x an even number ？（）
(1)If z is divided by 3, the remainder is 2.
(2)If x is divided by 5, the remainder is 2.
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）也充分.
E. 条件（1）和条件（2）单独都不充分，条件（1）和条件（2）联合起来也不充分.
[简答题]阳性预测值(positive predictive value)
[单项选择]For the positive numbers, n, n+1, n+2, n+4 and n+8, the mean is how much greater than the median ？（）
A. 0
B. 1
C. n+1
D. n+2
E. n+3
[单项选择]执行下列程序段后，变量s的值是（）。
Dim S As Integer，n As Integer
S=0:n=1
Do While n＜100
S=S+N
n=n+1
Loop
A. 5050
B. 4950
C. 3000
D. 4000
[单项选择]
程序
PARAMETER (N=3)
INTEGER A(N，N)
READ *, A
DO 10 J=1，N
LS=0
DO 20 I=1，N
20 LS=LS+A(I，J)
LS=LS/N
DO 30 I=1，N
30 A(I，J)=A(I，J) -LS
10 CONTINUE
PRINT *, A
END
若输入2，4，6，8，10，12，14，16，18
程序执行后，A(3，2)为（）。
A. -2
B. 0
C. 2
D. 12
[单项选择]执行下列程序段后，变量S的值是______。
Dim S As Integer,n As Integer
S=0:n=1
Do While n＜100
S=S+n
n=n+1
Loop
A. 5050
B. 4950
C. 3000
D. 4000
[单项选择]Is the integer n a multiple of 140 ？（）
(1) n is a multiple of 10.
(2) n is a multiple of 14.
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）也充分.
E. 条件（1）和条件（2）单独都不充分，条件（1）和条件（2）联合起来也不充分.
