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292. The pages of a report are numbered consecutively from 1 to 10. If the sum of the page numbers up to and including page number x of the report is equal to one more than the sum of the page numbers following page number x, then x=(没读懂题)
A 4
B 5
C 6
D 7
E 8
405,If a 3-digit integer is selected at rendom from the integers 100 through 199, inclusive, what is the probablity that the first digit and the last digit of the integer are each equal to one more than the middle digit?(此题压根没看懂意思)
A 2/225
B 1/111
C 1/100
D 1/100
E 1/50
418.If xy=165, where x and y are positive integers and x>y, what is the least possible value of x-y?(请问各位什么是 the leastpossible)
A 2
B 4
C 8
D 15
E 28
433.If n is a prime number greater than 3,what is the remainder when n^2 is divided by 12?
A 0
B 1
C 2
D 3
E
487. X,Y,Z each try independently to solve a problem. If their individual probablities for success are 1/4,1/2,and 5/8,respectively, what is the probablity that X and Y,but not Z,will solve the problem?
A 11/8
B 7/8
C 9/64
D 5/64
E 3/64
568. What is the least number of digits (including repetitions) needed to express 10^100 in decimal notation?(同样没读懂题意)
A 4
B 100
C 101
D 1000
E 1001 |
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发表于 2010-4-27 18:53:16
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