SOLUTION: An electronics store receives a shipment of 20 graphing​ calculators, 8 that are defective. Four of the calculators are selected to be sent to a local high school. ​(A) How ma

Algebra ->  Probability-and-statistics -> SOLUTION: An electronics store receives a shipment of 20 graphing​ calculators, 8 that are defective. Four of the calculators are selected to be sent to a local high school. ​(A) How ma      Log On


   

Question 1150506: An electronics store receives a shipment of 20 graphing​ calculators, 8 that are defective. Four of the calculators are selected to be sent to a local high school.
​(A) How many selections can be​ made?
​(B) How many of these selections will contain no defective​ calculators?
Answer by ikleyn(52900) About Me  (Show Source):
You can put this solution on YOUR website!
.

(A)  C%5B20%5D%5E4 = %2820%2A19%2A18%2A17%29%2F%281%2A2%2A3%2A4%29.


(B)  C%5B20-8%5D%5E4 = C%5B12%5D%5E4 = %2812%2A11%2A10%2A9%29%2F%281%2A2%2A3%2A4%29.

------------------

On Combinations,  see introductory lessons
    - Introduction to Combinations
    - PROOF of the formula on the number of Combinations
    - Problems on Combinations
    - OVERVIEW of lessons on Permutations and Combinations
in this site.

Also,  you have this free of charge online textbook in ALGEBRA-II in this site
    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic  "Combinatorics: Combinations and permutations".


Save the link to this textbook together with its description

Free of charge online textbook in ALGEBRA-II
https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson

into your archive and use when it is needed.