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Among all the prime numbers within 15

Quantity A

The product of them all

Quantity B

The greatest prime number to the power of 5


The number of children in a certain family is a prime number less than 10. The number of boys in the family is greater than the number of girls, and the number of boys is a prime number. If at least 1 of the children in the family is a girl, which of the following could be the number of boys in the family?

Indicate all such numbers.
Two different prime numbers are greater than 2 and less than 50. If the product of them is less than 100, then how many combinations of them will there be?
0 < P*Q < 100, P and Q are both prime numbers,and P < Q, how many combinations of P and Q are there?
How many positive integers no greater than 20 can be expressed as the sum of two different prime numbers?
1575=$$3^{x}$$*$$5^{y}$$*$$7^{z}$$,What`s the value of x+y+z?

Quantity A

The number of different prime factors of 12

Quantity B

The number of different prime factors of 9


Quantity A

The number of prime factors of 27

Quantity B

The number of prime factors of 18


m is an odd number and greater than 1

Quantity A

The greatest prime factor of 2m

Quantity B

The greatest prime factor of $$m^{2}$$




k and n are consecutive positive odd integers.

Quantity A

The least common multiple of k and n

Quantity B

kn


If$$ $$a, $$b$$, and $$c$$ are positive integers such that $$\frac{a}{c}=0.075$$, and $$\frac{b}{c}=0.09$$, What is the least possible value of $$c$$?
y=105n (n is a positive integer)

y is both the square of an integer, and a multiple of 30

What is the least possible value of n?
N is an integer between 10 and 100. When N is divided by 4, 6, and 7, the remainder is 2.

Quantity A

The remainder when N is divided by 11

Quantity B

9


How many positive two-digit integers have a remainder of 3 when divided by both 10 and 6?
If a, b and c are integers such that 0 < a < b < c < 2a, what is the greatest common factor of $$84^{a}$$, $$126^{b}$$, and $$98^{c}$$?
When r percent is expressed as a fraction and the fraction is reduced to lowest terms, the result is $$\frac{n}{20}$$, where n is an integer. Which of the following could be the value of r?
In a pile of books, $$\frac{1}{3}$$ are biography books, $$\frac{1}{4}$$ are chemistry books, while another $$\frac{1}{5}$$are math books. What ratio of all books are books other than the three subjects of books listed above?

Give your answer as a fraction.
If ($$\frac{3}{5}$$)x-($$\frac{1}{3}$$)x=$$\frac{2}{15}$$, then $$\frac{1}{x}$$=?
n is a positive integer

Quantity A

$$\frac{n+2}{n+1}$$ - $$\frac{n+1}{n}$$

Quantity B

0


The function f is defined by f(n)= $$\frac{2n-1}{2n+1}$$for all positive integers n. What is the least positive integer m for which the product (f(1))(f(2))......(f(m)) is less than or equal to $$\frac{1}{15}$$?

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