Need math help with a word problem Involving permulations

Mathematics
Tutor: None Selected Time limit: 1 Day

you have to answer 2 essay questions for an exam.  There are 8 essays to choose from. how many different groups of 2 essays could you possibly choose ?

Nov 25th, 2015

Thank you for the opportunity to help you with your question!

number of question to answer=2

number of all question=8

so the number of different groups to choose=8C2

8C2=8!/(8-2)!2!

=8!/6!2!

=8*7*6!/6!2!

=56/2

=28

so the number of different groups to choose=28

Please let me know if you need any clarification. I'm always happy to answer your questions.
Nov 25th, 2015

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Nov 25th, 2015
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Nov 25th, 2015
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