SOLUTION: A student is asked to answer 9 out of 13 questions on an exam. (a) Classify the problem as a permutation, a combination, or neither. (a)permutation (b)combination (c)neither

Algebra ->  Permutations -> SOLUTION: A student is asked to answer 9 out of 13 questions on an exam. (a) Classify the problem as a permutation, a combination, or neither. (a)permutation (b)combination (c)neither      Log On


   

Question 536638: A student is asked to answer 9 out of 13 questions on an exam.
(a) Classify the problem as a permutation, a combination, or neither.
(a)permutation
(b)combination
(c)neither

(b) In how many ways can she select the questions to be answered?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
a) This is a combination since the order does not matter.


b) There are 13 C 9 = (13!)/(9!(13-9)!) = 715 different ways


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