3 years ago

How many ways can a librarian arrange 15 books on a top shelf if she has 20 books from which to pick?

2 answers:

8 0

Use the permutation formula
nPr = (n!)/((n-r)!)
20P15 = (20!)/((20-15)!)
20P15 = (20!)/(5!)

The final answer is choice A

Inga [223]3 years ago

8 0

The correct answer is A turned this in got a 100 hoped this helped ya.

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26 × (-5 + 3)= step by step

lina2011 [118]

<em>Hello ~</em>

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My name is lrxdscent, and I will be answering your question today! :D

Let's go by step-by-step ~

<h2>→ <u>Answer :-</u></h2>

<u />

<u /> $\sf{= -52x}$

<h2>→ <u>Explanation :-</u></h2>

<u />

<u /> $\sf{26x \: (-5 \: + \: 3)$

$\sf{Add \: the \: numbers: \: -5 \: + \: 3 = -2}$

$\sf{= 26x \: (-2)$

$\sf{Multiply \: the \: numbers: \: 26 \: (-2) \: = \: -52}$

$\sf{= -52x}$

Hope It Helps! ~

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<em /> $\underline{Answer :}$

ɪ ʀ x ᴅ ꜱ ᴄ ᴇ ɴ ᴛ

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