A location network is connected by 10 lines. If one of the lines breaks, the whole net falls apart. During a time of T, the probability that each of 10 lines will break is 0.6, then, what is the probability that the net will fall apart during time period T?

N is an integer greater than 6, which of the following must be divisible by 3?

The choices are n(n+5)(n-3), n(n+2)(n+5), n(n+1)(n-4) , n(n+1)(n-2), and so on.

1/91+1/92+…1/100=S. Which of the following is less than S?

I.1/8
II. 1/9
III. 1/10

In a market, the average expiration time for all milk (package with carton?) is 9.6 days. For all x, the amount of the milk with an expiration greater than 9.6+x is equal to the milk with an expiration less than 9.6-x. If the expiration for 68% of the milk is greater than (or within?) 2.1 days, what percent of milk have expiration greater than 11.7 days?

A 16%
B 32%
C68%
D 84%
D 96%

Six people raced together. If the gold medal winner finished the race in 15 minutes, and no any two athletes finished the race in the same time, did the silver medal winner finish the race in less than 15 minutes and 40 seconds?

1). The average time they cost was 16 minute.
2). The last one cost18 minutes, the silver winner cost 1’21″ less than the fifth one (uncertain), and the third one is one second quicker than the fourth one.

IN MY OPINION THE CORRECT WORDING SHOULD BE

Six people raced together. If the gold medal winner finished the race in 15 minutes, and no any two athletes finished the race in the same time, did the silver medal winner finish the race in less than 15 minutes and 40 seconds?

Each segment from A to G has equal distance. Which of the following point represents [-(3^12)] ?

If ((t^2)-1)/(t-1)=2, then what value(s) may t have?

A) 1 only
B) -1 only
C) 1 or -1
D) no values
E) an infimite number of values

On July 1, 1982, Ms. Fox deposited $10,000 in a new account at the annual interest rate of 12 percent compounded monthly. If no additional deposits or withdrawals were made and if interest was credited on the last day of each month, what was the amount of money in the account on September 1, 1982?

(A) $10,200
(B) $10,201
(C) $11,100
(D) $12,100
(E) $12,544

For every positive integer ‘n’ the h(n) is defined to be product of all even integer from 2 to n inclusive. If ‘P’ is the smallest prime factor of h(100)+1, then P is between ?

a) 3 and 10

b) 10 and 20

c) 20 and 30

d) 30 and 40

e) 40 and above.

A certain junior class has 1000 students and a certain senior class has 800 students. Among these students, there are 60 siblings pairs, each consisting of 1 junior and 1 senior. If 1 student is to be selected at random from each class, what is the probability that the 2 students selected will be a sibling pair?

a) 3/40,000
b) 3/20,000
c) 1/32
d) 1/20,000
e) None of these
Please post the explanations if you know.

The curved surface area of a cylinder is 24/7 times the total flat surface area(top +bottom).If the biggest possible cone is cut out from the cylinder, what is the ratio of the curved surface area of the cone to its flat surface area?

A) 24/7
B) 25/7
C) 27/7
D) 29/7
E) 30/7

At a certain diner, a hamburger and coleslaw cost $3.59, and a hamburger and french fries cost $4.40. If french fries cost twice as much as coleslaw, how much do french fries cost?
(A) $0.30
(B) $0.45
(C) $0.60
(D) $0.81
(E) $1.62

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An accrediting agency set up a proficiency test for a lab in which 20 percent of the samples were injected with a contaminant. If the lab correctly labeled 80 percent of the contaminated samples but incorrectly labeled 5 percent of the uncontaminated samples, then what percent of the samples labeled by the lab as uncontaminated were actually contaminated?

(A) 4%

(B) 5%

(C) 10%

(D) 20%

(E) 25%

If x,y and z are integers, is the product xyz even ?

1) x is odd
2) z/2 is odd

A) Statement 1 alone is sufficient but statement 2 alone is not sufficient to answer the question asked.

B) Statement 2 alone is sufficient but statement 1 alone is not sufficient to answer the question asked.

C) Both statements 1 and 2 together are sufficient to answer the question but neither statement is sufficient alone.

D) Each statement alone is sufficient to answer the question.

E) Statements 1 and 2 are not sufficient to answer the question asked and additional data is needed to answer the statements.

A certain university will select 1 of 7 candidates eligible to fill a position in the mathematics department and 2 of 10 candidates eligible to fill 2 identical positions in the computer science department. If none of the candidates is eligible for a position in both departments, how many different sets of 3 candidates are there to fill the 3 positions?

A) 42
B) 70
C) 140
D) 165
E) 315

Yesterday Diana spent a total of 240 minutes attending a training class, responding to E-mails, and talking on the phone) If she did no two of these three activities at the same time, how much time did she spend talking on the phone?

(1) Yesterday the amount of time that Diana spent attending the training class was 90 percent of the amount of time that she spent responding to E-mails.
(2) Yesterday the amount of time that Diana spent attending the training class was 60 percent of the total amount of time that she spent responding to E-mails and talking on the phone.

A) Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B) Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C) BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D) EACH statement ALONE is sufficient.
E) Statements (1) and (2) TOGETHER are NOT sufficient.

A certain river has current of 3 miles per hour. A boat takes twice as long to travel upstream between two points as it does to travel downstream between the same two points. What is the speed of the boat in still water ?

A) 3 miles per hours
B) 6 miles per hours
C) 9 miles per hours
D) 12 miles per hours
E) The speed cannot be determined from the given ingformation

A group of 8 friends want to play doubles tennis. How many different ways can the group be divided into 4 teams of 2 people?

A. 420
B. 2520
C. 168
D. 90
E. 105

If y ? 3 and 3x/y is a prime integer greater than 2, which of the following must be true?

I .  x = y
II.  y = 1
III.  x and y are prime integers.

(A) None
(B) I only
(C) II only
(D) III only
(E) I and II

The number of different words ending and beginning with a consonants which can be made out of the letters of the word EQUATION is

a) 5200

b) 4320

c) 1295

d) 3000

e0 4200