MikeyMaximum
  • MikeyMaximum
Ms. Lunette has 18 students in her class. She wants to send 3 of these students to pick up books for the class. How many combinations of 3 students can she choose? A. 6 B. 54 C. 816 D. 4896
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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MikeyMaximum
  • MikeyMaximum
I know for sure that the answer is not either A or D
MikeyMaximum
  • MikeyMaximum
I think most likely C
MikeyMaximum
  • MikeyMaximum
tbh I'm not sure

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imqwerty
  • imqwerty
The number of ways of selecting 'r' number of different things from 'n' number of different things is nCr. So, here, Ms. Lunette has to select 3 different students from 18 different students. The Number of ways of doing so is 18C3 = 18!/3!(18-3)! = 18!/3!15! = (16 * 17 * 18) / (1 * 2 * 3) = 816. The answer is c.
nincompoop
  • nincompoop
can she repeat people?
anonymous
  • anonymous
18C3 = 816
MikeyMaximum
  • MikeyMaximum
Yes She can
nincompoop
  • nincompoop
then follow qwerty's concept
MikeyMaximum
  • MikeyMaximum
ok Thx 2 all who came to help thou
imqwerty
  • imqwerty
;)

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