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
Genrish500 [490]
3 years ago
12

we need to make a number code with 4 digits. how many codes have at least two equal digits? and how many codes have exactly 3 eq

ual digits?
Mathematics
1 answer:
Blizzard [7]3 years ago
6 0

Answer:

First do the case in which none of the digits is 0.

There are 9 ways to choose the digit that repeats 3 times and 8 ways to pick the other, after this there are 4 ways to order the digits. So 9×8×4.

Now we look at the cases in which the digit 0 repeats 3 times. Clearly the 9 numbers are 1000,2000,3000,…,9000.

Lastly we look at the cases in which 0 appears once. There are 9 ways to pick the other digit and 3 ways to order.

So the final answer is 9×8×4+9+9×3.

You might be interested in
Rob owes Debra $36 and pays her 1/3 of what he owes. How much does he now owe?
wolverine [178]

Answer:

24

Step-by-step explanation:

6 0
2 years ago
Read 2 more answers
The health insurance company that insured Peter pays 80% of nutritional counseling after Peter pays a $50 deductible the cost of
brilliants [131]

Answer:

Peter will pay:

  • $50 deductible
  • 20% x ($1,060 - $50) = $202
  • total $252

the insurance company will pay:

  • (total counseling cost - deductible) x 80% = ($1,060 - $50) x 80% = $808

The deductible refers to the amount of money an insured has to pay before the health insurance company starts to pay partially or completely for your health treatment. deductibles are commonly used for other types of insurance policies also, including auto insurance.

6 0
3 years ago
Which scenario would result in 12 possible outcomes?
Gnesinka [82]

Answer:

You roll a number cube, and then you flip a coin.

Step-by-step explanation:

i don't even know how math is confusing. (this is the right answer on the quiz)

5 0
2 years ago
Please helpppppp!!!!
chubhunter [2.5K]

Answer:

A. -34.5>x

Step-by-step explanation:

The area is shaded below -34.5, so we know that x has to be less

6 0
3 years ago
28 is increased by 150%. what's the final number
sp2606 [1]

Answer:

70

Step-by-step explanation:

20x(1+150%)

28x(1+1.5)

28x2.5

70

5 0
2 years ago
Other questions:
  • What is 27kg+ 547g+ 694g equal to?
    11·2 answers
  • What is 3.58333333333 as a fraction in simplest form?
    8·1 answer
  • Solve the following equation for y.
    13·2 answers
  • Add the sum of the numbers (−5.4) and (+8.2) to the opposite number of (−2 3/4 ).
    11·2 answers
  • A triangle is rotated 90° about the orgin. Which rule describes the transformation
    13·1 answer
  • How many even numbers are between 11 and 30​
    10·1 answer
  • What value of x makes the equation true?3(x − 4) = 15 <br> A.–1<br> B.1<br> C.7<br> D.9
    13·1 answer
  • Which does NOT represent the interior angle measures of a triangle?
    14·2 answers
  • 5. Factor: x² - 4x-21
    5·2 answers
  • A teacher gives a 10-point to a class of 10 children.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!