mynamequin mynamequin
  • 22-02-2018
  • Mathematics
contestada

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

Respuesta :

mathmate
mathmate mathmate
  • 22-02-2018
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

Answer Link

Otras preguntas

pi times 11.2 squared
If the ratio of the vertical side to the horizontal side (length) of the ramp is 1: 12, then calculate the length of the ramp (answer in cm)​
If the average distance to the center of the earth is 6371 kilometers, and the average distance to mars is 141.6 million miles, what percentages are the distanc
3. What is the momentum (as a function of time) of a 5.0kg particle moving with a velocity 4 v(t) = (3i +j)m/s? What is the net force acting on this particle?​
G(ooydzabxdo) me.eet Maths??? s=x​
19. For the force system acting on a body OABC as shown. Determine the magnitude direction and position of resultant force. ​
Everyone at Kayla's school wore either yellow or green for school spirit day. 43 students wore yellow and 57 students wore green. What percentage of the student
Does anyone know how to solve this ?
Combatting gingivitis requires special attention to oral hygiene. One must brush and floss daily, as well as use medicated mouthwash. After approximately one mo
-3m + 9 (Hint: Find the GCF)