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A box contains 10 red balls and 6 blue balls. A volunteer takes two balls one by one without replacement. What is the probability that the two balls are both red?
Give your answer as a fraction.
A bag contains 6 blue marbles and 10 red marbles. Two marbles will be selected at random from the bag, one at a time and without replacement. What is the probability that one of the selected marbles will be blue and one of the selected marbles will be red?
Give your answer as a fraction.
In a box, there are 1 red ball, 4 purple balls and 95 green balls. Someone randomly selects 2 balls from the box without replacement

Quantity A

The probability that one of the two balls is red

Quantity B

The probability that both balls are purple


M and N are both positive integers

3M+4N=13

Quantity A

N

Quantity B

2


What is the least positive integer that is not a factor of 25! and is not a prime number?
If k is the greatest positive integer such that $$3^{k}$$ is a divisor of 15! then k =?
If both $$2^{a}$$ and $$3^{b}$$ are factors of 12!, what is the greatest possible value of (a+b)?
How many positive factors does 1,575 have?
16,000 has how many positive divisors?
If both n and $$\frac{72}{n}$$ are positive integers, then how many values could n have?
The square of which of the following numbers is 4 more than the positive multiple of 5?

Indicate all such numbers.
What is the number of integers between 1 and 226, inclusive, that are both multiples of 4 and perfect square numbers?
How many integers from 100 to 200, inclusive, are multiples of 5 but not multiples of 4?
How many integers from 1 to 603, inclusive, are multiples of 2 or 3?
How many of the integers from 1 to 100, inclusive, are not multiples of 3 or 7?
54 is divisible by $$3^{N}$$, while 192 is divisible by $$3^{K}$$ (N and K are both integers)

Quantity A

N


Quantity B

K


The "reflection" of a positive integer is obtained by reversing its digits. For example, 321 is the reflection of 123 The positive difference between a five-digit integer and its reflection must be divisible by which of the following?
If a, b, c are three consecutive positive even integers, which of the following must be an integer?

Indicate all that's possible.
If n is a positive integer greater than 1, then n($$n^{2}$$-1) must be a multiple of which of the following integers?

Indicate all such numbers.
$$s$$ and $$t$$ are both positive integers

Which of the following statements individually provide(s) sufficient additional information to determine $$\frac{t}{s}$$ is an integer?

Indicate all such statements.

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