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
son4ous [18]
3 years ago
12

How many different twotwo​-letter passwords can be formed from the letters

Mathematics
1 answer:
Anna [14]3 years ago
5 0

Answer:

70

Step-by-step explanation:

GIVEN: two two​-letter passwords can be formed from the letters  A, B, C, D, E, F, G and H.

TO FIND: How many different two two​-letter passwords can be formed if no repetition of letters is​ allowed.

SOLUTION:

Total number of different letters =8

for two two​-letter passwords 4 different are required.

Number of ways of selecting 4 different letters from 8 letters=^8C_4

                                                                                                   =\frac{8!}{4!4!}

                                                                                                  =70

Hence there are 70 different two-letter passwords can be formed using 8 letters.

You might be interested in
Jayden recently learned that the atmosphere is made of gases. Which is NOT a way in whichgases are helpful to life on Earth?A.It
snow_lady [41]

Answer:

A. It provides carbon monoxide to help plants grow.

Step-by-step explanation:

The only incorrect option is that carbon monoxide is required by plant, but the correct statement would be carbon dioxide is required my plants, for its growth, which helps to perform the process of photosynthesis.

The rest of the statements are correct.

As, the atmosphere acts as a blanket, which protects the earth from the harmful rays of the sun.

And, atmosphere constitute of various gases, which enables the living organisms to breath.

And, the atmosphere protects from any meteors entering from space.  

3 0
3 years ago
I need help please!!!
Alenkinab [10]

Answer:D

Step-by-step explanation:

5 0
3 years ago
Find a irrational number between 7.7 and 7.9 explain why it’s irrational
Alexeev081 [22]
7.77777777 repeating

Irrational numbers are:

Numbers that repeat 
7.7777777 repeats the number 7 after the decimal

Numbers that CANNOT be written as a simple fraction.
7.7777777 cannot be written as a fraction in simplest form.

Answer = 7.777777777 repeating

~Aamira~

Hope this helped :)
8 0
3 years ago
Read 2 more answers
How to write 168.7 in expanded form
nadya68 [22]

Answer:

100 + 60 + 8 + 0.7

Step-by-step explanation:

Expanded form or expanded notation is a way of writing numbers to see the value of individual digits.

3 0
3 years ago
Read 2 more answers
Solve the right angle trig problem.
Lisa [10]

Answer:

x = 40.7057°

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

<u>Trigonometry</u>

  • [Right Triangle Only] sin∅ = opposite over hypotenuse

Step-by-step explanation:

<u>Step 1: Define</u>

We have a right triangle. We can use trig to find the angle.

<u>Step 2: Identify Variables</u>

Angle = <em>x</em>

Opposite = 15

Hypotenuse = 23

<u>Step 3: Find Angle </u><em><u>x</u></em>

  1. Substitute:                    sinx° = 15/23
  2. Inverse:                         x° = sin⁻¹(15/23)
  3. Evaluate:                       x = 40.7057°
6 0
3 years ago
Other questions:
  • In the equation 8x - 1=3x+4 the variable x represents the same value. Which value of x is the solution of the equation x = 0 1 2
    10·1 answer
  • Which of the following is an irrational number?<br> 81/37<br><br> 85<br> 25<br> 47
    6·1 answer
  • Please answer, i will give a brainliest
    10·2 answers
  • A certain financial services company uses surveys of adults age 18 and older to determine if personal financial fitness is chang
    12·1 answer
  • Which transformations could be performed to show that
    11·1 answer
  • A bag has 5 balls: 1 red (R), 1 green (G), 1 yellow (Y), 1 blue (B), and 1 orange
    15·1 answer
  • Help me on this question. would be nice if you could also graph it as well​
    12·1 answer
  • A man Buy television set at a price exclusive of sales tax for $2124 if sales tax of 12% is changed how much money does the man
    13·1 answer
  • Henry's Moving Company charges an initial fee of $50 plus $20 per hour (h). The total cost
    10·1 answer
  • PLEASE SOLVE THIS FAST 6x=10x+4
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!