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
aleksandrvk [35]
3 years ago
8

How many 4-letter passords can be made using the letters A thought Z if...

Mathematics
1 answer:
Kazeer [188]3 years ago
8 0

Answer:

26^4 if repetition is allowed, 26 \times25\times24\times23 if repetition is not allowed.

Step-by-step explanation:

For the first case, we have a choice of 26 letters <em>each step of the way. </em>For each of the 26 letters we can pick for the first slot, we can pick 26 for the second, and for each of <em>those</em> 26, we can pick between 26 again for our third slot, and well, you get the idea. Each step, we're multiplying the number of possible passwords by 26, so for a four-letter password, that comes out to 26 × 26 × 26 × 26 = 26^4 possible passwords.

If repetition is <em>not </em>allowed, we're slowly going to deplete our supply of letters. We still get 26 to choose from for the first letter, but once we've picked it, we only have 25 for the second. Once we pick the second, we only have 24 for the third, and so on for the fourth. This gives us instead a pretty generous choice of 26 × 25 × 24 × 23 passwords.

You might be interested in
Find the value of x. The diagram is not to scale
Svetllana [295]

Answer:B-70

Step-by-step explanation:

from the figure, In \triangle ABC\ \text{and}\ \triangle ADE

\Rightarrow \dfrac{45}{45}=\dfrac{24}{24}\\\Rightarrow \dfrac{1}{1}=\dfrac{1}{1}

\therefore \text{two triangles are similar}

Thus we can write

\Rightarrow \dfrac{35}{x}=\dfrac{45}{45+45}\\\\\Rightarrow x=35\times \dfrac{90}{45}=35\times 2=70

8 0
3 years ago
Omg please help for brainlist !!!!!!!!!!!!!!!!!!!
zhannawk [14.2K]

Answer:

f(x) is linear

g(x) is exponential

Step-by-step explanation:

A linear function will always have the same rate of change between equally distant points, while an exponential function will have an increasingly large rate of change between equally distant points.

First, look at f(x). All these points are equally distant at 2 units apart on the x-axis, so they can be directly compared:

(-38)-(-18)=-20\\(-58)-(-38)=-20\\(-78)-(-58)=-20

All of these points are the same distance apart on the y, so f(x) must be a linear function.

Now look at g(x). These are also all equally distant at only 1 unit apart.

30-10=20\\90-30=60\\270-90=180

These are very clearly not the same distance apart on the y, so g(x) must be the exponential function.

6 0
2 years ago
5x + 2y = 20, when x = 0.3
crimeas [40]
Y = 9.25 just multiply 5 by .3 and add the 2 and subract that to find y
4 0
3 years ago
Read 2 more answers
Ayuda es para un examen
Kazeer [188]
Es 5 por la x y la y
4 0
3 years ago
Simon used 3 pears and 9 apples to make a fruit salad. What is the ratio of the number of pears to the number of apples in the f
Yanka [14]

Answer:

  1 : 3

Step-by-step explanation:

pears : apples = 3 : 9 = 1 : 3

___

A common factor of 3 can be removed from each number in the ratio to reduce it to lowest terms.

3 0
3 years ago
Other questions:
  • Geometry math question no Guessing and Please show work thank you
    10·1 answer
  • What angle would you need on a pie graph for a section that represented 25% of the
    5·1 answer
  • A.1/9 B.1/4 C.1/6 D.1/2
    12·2 answers
  • What W is, to make it a true statement
    13·2 answers
  • In ΔABC, if the length of sides a, b, and c are 3.5 centimeters, 5.5 centimeters, and 6 centimeters respectively, what is m∠C to
    7·2 answers
  • What's 5 to the first power
    14·1 answer
  • Which expression represents “6 more than x”? A. x−6
    14·2 answers
  • What is the answer to this 6.7w- (-3)w = -5?
    13·2 answers
  • 8x10^30/2x10^12 in scientific notation?
    11·1 answer
  • If f(x) = 5x + 40, what is f(x) when x=-5?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!