By Miranda Menestrina
- **Mar 5**, 02:00 AM

Math (PS)
If is a positive integer, is defined as the number of positive integers which are less than and do not have common factor with other than 1. If is prime then
(A)
(B)
(C)
(D)
(E) 2
Question Discussion &...

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By Miranda Menestrina
- **Feb 24**, 02:00 AM

Math (PS)
A basket contains 3 blue marbles, 3 red marbles, and 3 yellow marbles. If 3 marbles are extracted from the basket at random, what is the probability that a marble of each color is among the extracted?
(A)
(B)
(C)
(D)
(E)
Question Discussion &...

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By Miranda Menestrina
- **Feb 21**, 02:00 AM

Math (PS)
During the break of a football match the coach will make 3 substitutions. If the team consists of 11 players among which there are 2 forwards, what is the probability that none of the forwards will be substituted?
(A)
(B)
(C)
(D)
(E)
Question Discussion...

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By Miranda Menestrina
- **Feb 20**, 02:00 AM

Math (PS)
How many real roots does this equation have?
(A) 0
(B) 1
(C) 2
(D) 3
(E) 4
Question Discussion & Explanation
Correct Answer - A - (click and drag your mouse to see the answer)
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By Miranda Menestrina
- **Feb 19**, 02:00 AM

Math (PS)
Function is defined as follows:
if is positive or 0 then ;
if is negative then .
Which of the following is true about ?
I.
II.
III.
(A) I only
(B) II only
(C) III only
(D) I and III only
(E) not I, II, or III
Question Discussion...

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By Miranda Menestrina
- **Feb 18**, 02:00 AM

Math (PS)
How many odd three-digit integers greater than 800 are there such that all their digits are different?
(A) 40
(B) 56
(C) 72
(D) 81
(E) 104
Question Discussion & Explanation
Correct Answer - C - (click and drag your mouse to see the answer)
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By Miranda Menestrina
- **Feb 13**, 02:00 AM

Math (PS)
A smith received an order to make a 1 million liter cube-shaped tank (note that 1 cubic meter = 1,000 liters of water). If he has only 4 meter by 2 meter sheets of metal that can be cut, how many metal sheets will...

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By Miranda Menestrina
- **Feb 12**, 02:00 AM

Math (PS)
If and , which of the following must be true, assuming ?
(A)
(B)
(C)
(D)
(E)
Question Discussion & Explanation
Correct Answer - С - (click and drag your mouse to see the answer)
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By Miranda Menestrina
- **Feb 11**, 02:00 AM

Math (PS)
Water flows into an empty tank of 54 liters via 12 small pipes. The rate of each pipe is 1 liter per hour. However, water flows out of the tank via several big pipes at the rate of 1.5 liter per hour. If after...

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By Miranda Menestrina
- **Feb 7**, 02:00 AM

Math (PS)
If a portion of a half water/half alcohol mix is replaced with 25% alcohol solution, resulting in a 30% alcohol solution, what percentage of the original alcohol was replaced?
(A) 3%
(B) 20%
(C) 66%
(D) 75%
(E) 80%
Question Discussion & Explanation
Correct Answer - E - (click and drag...

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