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
ser-zykov [4K]
3 years ago
14

How many sets of 7 questions can be chosen from a file of 25 questions?

Mathematics
1 answer:
likoan [24]3 years ago
3 0
If all 25 questions are different,

When order of selection counts:
P(25,7)
=25!/(25-7)!
=15511210043330985984000000/6402373705728000
=2422728000

When order of selection does not count count:
C(25,7)
=25!/(7!*(25-7)!)
=15511210043330985984000000/(6402373705728000*5040)
=480700

You might be interested in
Using Euler’s formula, how many edges does a polyhedron with 20 faces and 12 vertices have?
astra-53 [7]

Euler's formula for a polyhedron is given by:

\begin{gathered} F+V=E+2 \\ \text{where,} \\ F=\text{faces} \\ V=\text{vertices} \\ E=\text{edges} \end{gathered}

Make E, the subject of the formula:

\begin{gathered} F+V=E+2 \\ E=F+V-2 \end{gathered}

Put F = 20, V = 12, to obtain E,

\begin{gathered} E=20+12-2 \\ E=30 \end{gathered}

Therefore, there are 30 edges

3 0
1 year ago
It costs $70 for 50 tickets. How much does each ticket cost?
liberstina [14]
1 dollar and 40 cents
5 0
3 years ago
Read 2 more answers
Are you good at maths?????????????????????????
Flauer [41]

The probability that a student, chosen at random, does not study chemistry is 20/41.

<h3>What is Probability?</h3>

Probability can be defined as the ratio of the number of favorable outcomes to the total number of outcomes of an event. For an experiment having 'n' number of outcomes, the number of favorable outcomes can be denoted by x. The formula to calculate the probability of an event is as follows.

Probability(Event) = Favorable Outcomes/Total Outcomes = x/n

Here, Total number of student = 41

         Student who does not study chemistry = 20

So, the probability = favorable outcome / total outcomes

             P(not studying chemistry) = 20 / 41

Thus, The probability that a student, chosen at random, does not study chemistry is 20/41.

Learn more about Probability from:

brainly.com/question/11234923

#SPJ1

7 0
2 years ago
300 has how many<br> 2/3 in it?
coldgirl [10]
450


hope this helps !!!
8 0
3 years ago
Read 2 more answers
A plumber charges $50 for a house call plus an additional $12 per hour for labor
velikii [3]
$62 is both numbers added together
6 0
2 years ago
Other questions:
  • What is the perimeter of 16cm 25cm
    10·2 answers
  • Which is the graph of y = (x – 1)4 – 3?
    11·1 answer
  • Gerald can complete a math assignment in 2 hours and a physics assignment in 1 hour. If he has 8 hours to complete a set of assi
    9·2 answers
  • What Number is X in this equation? <br><br> 9 - 3 ÷ 1/3 + 1 = X
    13·2 answers
  • When constructing a confidence interval for a population mean, if a population is normally distributed and a small sample is tak
    6·1 answer
  • Which of the following equations below has a slope of 1/3
    5·1 answer
  • Simplify<br> 43 +4.5<br> Plzzz help!!!!!!
    12·2 answers
  • Is the height of 6 and the volume of 96 proportional to the height of 4 and the volume of 64​
    15·2 answers
  • The product o 4z and 0 is
    6·1 answer
  • Each interior angel of a regular polygon is 160°. How many sides does it have? Find the interior angel of a regular polygon with
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!