1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Alecsey [184]
3 years ago
8

Two cards are selected from a standard deck of 52 playing cards. The first card is not replaced before the second card is select

ed . Find the probability of selecting a black card and selecting a red card. The probability of selecting a black card and then selecting a red card is
Mathematics
1 answer:
Blizzard [7]3 years ago
5 0

Answer:

Probability is:   $ \frac{\textbf{13}}{\textbf{51}} $

Step-by-step explanation:

From a deck of 52 cards there are 26 black cards. (Spades and Clubs).

Also, there are 26 red cards. (Hearts and Diamonds).

First, we determine the probability of drawing a black card.

P(drawing a black card) = $ \frac{number \hspace{1mm} of  \hspace{1mm} black  \hspace{1mm} cards}{total  \hspace{1mm} number  \hspace{1mm} of  \hspace{1mm} cards} $  $ = \frac{26}{52} = \frac{\textbf{1}}{\textbf{2}} $

Now, since we don't replace the drawn card, there are only 51 cards.

But the number of red cards is still 26,

∴ P(drawing a red card) = $ \frac{number  \hspace{1mm} of  \hspace{1mm} red  \hspace{1mm} cards}{total  \hspace{1mm} number  \hspace{1mm}of  \hspace{1mm} cards} $  $ = \frac{26}{51}  $

Now, the probability of both black and red card = $ \frac{1}{2} \times \frac{26}{51} $

$ = \frac{\textbf{13}}{\textbf{51}} $

Hence, the answer.

You might be interested in
When Tara, a nurse, works on Saturdays, she is paid a $30 bonus plus $20 per hour worked.
erik [133]
Too much work…. Sorry
6 0
3 years ago
The circumference of a circle is 25.12 miles. What is the circle's diameter? C=25.12 mi Use 3.14 for ​pi
svetoff [14.1K]
The answer to your question is 8mi. I just divide the circumference by pi to find your diameter.
8 0
3 years ago
Read 2 more answers
You go to the doctor and he injects you with 13 milligrams of radioactive dye. After 12 minutes, 4.75 milligrams of dye remain i
photoshop1234 [79]

Answer:

Step-by-step explanation:

You need to find the model for this situation using the points given. If you are given 13 mg immediately, the coordinate point for that is (0, 13), where the x coordinate is the time in minutes and the y coordinate is the amount of dye in mg.

If after 12 minutes, 4.75 mg remain, the coordinate point for that is (12, 4.75). Just so you know, the time unit always goes in for x, never for y.

Now that we have these coordinates we are going to use them as a system and find the model. Begin with the point (0, 13) in

A=a(b)^t where A is the amount left in the body, a is the initial amount injected, b is the rate at which it decays, and t is the time in minutes. Plug in the first set of coordinates:

13=a(b)^0 and since anything raised to the power of 0 is equal to 1, we have

13 = a. Now we can use that and write another equation with the other set of coordinates to solve for b:

4.75=13(b)^{12} and divide both sides by 13 (don't round anything yet) to get

.3653846154 = b¹². Now take the 12th root of both sides (you need a scientific calculator for this) to get that

b = .9195228407  Yikes.

Now for the model, using the fact that a = 13 and b = .9195228407:

A=13(.9195228407)^t  

We are told that the amount that we are allowed to leave with still remaining in our system cannot be more than 2 mg, so we sub in a 2 for A:

2=13(.9195228407)^t and begin by dividing away 13 to get

.1538461538=.9195228407^t  Take the natural log of both sides, which allows us to bring the t out front:

ln(.1538461538) = t ln(.9195228407) and finally divide by ln(.9195228407) to get

t = 22.3 minutes

6 0
3 years ago
Solve the system of equations.<br> y=5x-9<br> y=3x +7
ELEN [110]
Download photomath it really helps and solves the question for you and shows you the steps
7 0
3 years ago
A fair number cube with 1, 2, 3, 4, 5 and 6 on its faces is rolled once. The dot on the number line below represents the probabi
KiRa [710]
I don't see the question.  Sorry :(
4 0
3 years ago
Other questions:
  • Is the relationship in the table linear,exponential,or neither? Explain how you know.
    8·1 answer
  • 36+69-171-717171-18 so what’s that equal too
    12·2 answers
  • I need to know!! How do you make the two equations solving for x and y which is song and pictures.
    8·2 answers
  • Rewrite 22/7 as a mixed number.
    12·1 answer
  • What is 14×4 in expanded form​
    11·2 answers
  • Help solving this math
    6·1 answer
  • If 15 people received an email and sent it to 3 different friends,who in turn each sent to 2 new people.What percent of the tota
    7·1 answer
  • The two windows shown are similar. What is the height of the larger window? the smaller one is 5 by 8 and the bigger one is 9.6
    13·1 answer
  • Each side of a square kitchen tile is 3 inches long. What is the tile's perimeter?
    13·1 answer
  • PLEASE HELP ME IGIVE YA'LL 12 POINTS PLEASE HELP ME
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!