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During each run of a computer simulation, either the letter X or the letter Y is displayed. For each run of the simulation, if the letter X is displayed, then the probability that X will be displayed in the next run is 0.3. Also for each run of the simulation, if the letter Y is displayed, then the probability that Y will be displayed in the next run is 0.4.

In 7 consecutive runs of the simulation, if X is displayed in the 5th run, what is the probability that X will be displayed in the 7th run?
Which of the following could be a factor of $$\frac{9!}{(6!)(3!)}$$?

Indicate all such numbers.
z is a positive integer. When 17 is divided by z, the remainder is 2.

Quantity A

z

Quantity B

4


n is a positive integer

Quantity A

The remainder when ($$n^{2}$$+3n+2) is divided by 6

Quantity B

2


How many positive two-digit integers have a remainder of 3 when divided by both 10 and 6?
If $$y=1-\frac{1}{x}$$, where $$x$$ is a nonzero integer, which of the following could be the value of $$y$$?

Indicate all such values.
The reciprocal of n equals 8 times the square of n.

Quantity A

$$\frac{1}{n}$$

Quantity B

2


What is the sum of the repeating decimals of the form $$0.\overline {cd}$$, where c and d are digits such that c < d and c+d=5?

Give your answer as a fraction.
1 acre=4,840 square yard

1 yard=3 feet

Quantity A

The number of square feet in 1 acre

Quantity B

40,000


One day in 1997 at a gas station in the United States near the border of Canada, gasoline was selling for $1.20 per gallon (United States dollars). On that day, 1 United States dollar could be exchanged for 1.25 Canadian dollars. If gasoline was being sold at an equivalent rate at a gas station across the border in Canada, which of the following calculations gives an approximate price, in Canadian dollars, for a liter of gasoline at the Canadian gas station that day? (1 gallon is approximately 3.785 liters.)
By draining 40 gallons of water from a tank, the amount of water in the tank was decreased from $$\frac{1}{5}$$ of the tank 's full capacity to $$\frac{2}{11}$$ of the tanks full capacity. Water was then added to the tank until the tank was full. How many gallons of water were added to the tank?
Two water faucets are used to fill a certain tank. Running individually at their respective constant rates, these faucets fill the empty tank in 12 minutes and 20 minutes, respectively. If no water leaves the tank, how many minutes will it take for both faucets running simultaneously at their respective rates to fill the empty tank?

Give your answer as a decimal.
The sum of n numbers is greater than 48. If the average (arithmetic mean) of the n numbers is 1.2, what is the least possible value of n?
x-y=1

Quantity A

$$x^{2}$$ - $$y^{2}$$

Quantity B

1


x≠0

y≠0

x+y≠0

Quantity A

$$x^{-3}$$+$$y^{-3}$$

Quantity B

$$(x+y)^{-3}$$


Which of the following is the best estimate of $$\frac{(16.8)(10^{3})}{(0.51)(10^{-11})}$$?
Which of the following is equal to $$\frac{1}{\frac{\sqrt{2}+1}{\sqrt{2}-1}}$$?
List L consists of the numbers 1-$$\frac{1}{k}$$ for all integers k from 1 to 100, inclusive. List M consists of the number 1 and the numbers 1-$$\frac{1}{k}$$ for all integers k from 1 to 100, inclusive.

Quantity A

The average (arithmetic mean) of the numbers in list L

Quantity B

The average (arithmetic mean) of the numbers in list M




Lines k and l lie in the xy-plane and are parallel.

Quantity A

a

Quantity B

b


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