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Among 30 jackets, 10 are red, 10 are black and 10 are yellow. When selecting 5 out of these 30 jackets, what is the probability that 3 red jackets, 1 black jackets and 1 yellow jackets are selected?
Give your answer as a fraction.
What is the probability that a number whose tens digit is no more than 3 and units digit is no more than 4 is selected when selecting a number from 100 to 159 (inclusive)?
Give your answer as a fraction.
Set R={-3, -2, -1, 0, 1, 2, 3}
Set T={-7, -6, -5, -4, -3, -2}
If an integer is to be randomly selected from set S and an integer is to be randomly selected from set R, what is the probability that the product of the two integers selected will be positive?
Give your answer as a fraction.
From a class of 8 students, of which 5 students are female, a president and a vice president are to be chosen at random. If a student cannot be both the president and the vice president, what is the probability that the president and the vice president will both be female?
Give your answer as a fraction.
What is the probability that A and B are both selected when you randomly select 40 people out of a pool of 100 people (A and B included)?
Give your answer as a fraction.
Each digit of a 3-digit integer is a positive integer that is divisible by 3. What is the probability that the tens digit of such integers is an odd number and the hundreds digit of the integer is an even number?
Give your answer as a fraction.
Of the 700 members of a certain organization, 120 are lawyers. Two members of the organization will be selected at random. Which of the following is closest to the probability that neither of the members selected will be a lawyer?
Each of the nine digits 1, 2, 3, 4, 5, 6, 7, 8, and 9 is marked on a separate slip of paper and the nine slips are placed in a box. Three slips of paper will be randomly selected with replacement, and in the order selected the digits will be used to form a 3-digit number.

Quantity A

The probability that the 3-digit number will be greater than 600

Quantity B

$$\frac{4}{9}$$


The probability that a person will succeed at a particular task is $$p$$.

Quantity A

$$p(1-p)$$

Quantity B

$$0.4$$


Probability XX of Event A means the ratio of the probability that Event A occurs to the probability that Event A does not occur. If Probability XX of getting heads when tossing a coin is $$\frac{3}{7}$$, then what is the probability of getting heads when tossing the coin?
Give your answer as a fraction.
A and B are mutually independent and the probability that Event A occurs is the same as that of the probability that Event B occurs (both equals to 0.3).

Quantity A

The probability that Event A occurs when Event B does not occur

Quantity B

0.3


Both box T and box U have some white balls and black balls. There are 20 white balls and 30 black balls in box T. If a person selects 1 ball randomly from each box, then the probability that both balls are white is 0.25. What is the probability of selecting a black ball from the box U?
Give your answer as a fraction.
If the probability for each cannon shoots the target is 0.6, how many cannons shoot together can you ensure the overall probability of shooting the target reach 0.99?
Indicate all such choices.
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.
Of the 7 balls in an urn, exactly one is red. Balls are to be selected from the urn one at a time, randomly and without replacement, until the red ball is selected. After the red ball is selected, no more balls will be selected.

Quantity A

The probability that a total of 3 balls will be selected

Quantity B

The probability that a total of 4 balls will be selected


Each of 10 balls has an integer 0 to 9, inclusive, painted on the side. Shane randomly pick on each time without replacement.

Quantity A

The probability that 5 is picked at the first time

Quantity B

The probability that 5 is picked not until the second time


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


When an even integer k is rounded to the nearest 10, the result is 530. What is the greatest possible value of k?
If the value of a double-digit number is twice the sum of its tens digit and units digit, then double-digit number must be?

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