Problem

Railroad Accidents A researcher wishes to study r…

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Problem 52 Hard Difficulty

DVD Selection How many ways can a person select 8 DVDs from a display of 13 DVDs?

Answer

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Intro Stats / AP Statistics

Elementary Statistics a Step by Step Approach

Chapter 4

Probability and Counting Rules

Section 4

Counting Rules

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Video Transcript

here we hope to find out the total number of ways off selection off the ladies. The number of combinations off our objects. Selector from an Objects is dinner order by NCR and See Ott is and C are equal toe in factorial by en minus. R factorial in tow are affected him in given data and is 13 because the total number off the Berries are cuttin soul. Here we are substituting the values off and on are 13. See art is eight because we have to select a deliveries from 13. Deal with these so in factory is starting factorial on n minus R E's 13 minus eight on again eight. Factorial 13 Factorial is 13 in tow well in tow. Livin in tow 10 in tow, nine in tow, eight into seven into six into fi into food into three in tow, two into one. Do what it but and minus R is starting minus eight. Equal. Do five factorial into Exacto. Really, it's sectorial. Is we converted as eight in do seven into six into five into four into three in tow to do one so we can cancel the eight factory in numerator and denominator so we're reminding them. Bows in numerator 13 into 12 in tow, 11 in tow, 10 into nine. In denominator, we have five factorial, that is. Fight into four in tow, three into two in tow. One if we cancel two times two on two. Our concert, you're three again. 33 will be can soon, so there is no numbers in ah, denominated except one. So we conducted as 13 in tow, living in tow. Nine. That is 1200 87 ways are there to select their DVDs from 13 deliveries to a deli's.

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