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natali 33 [55]
3 years ago
14

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

Mathematics
2 answers:
Jlenok [28]3 years ago
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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Pepsi [2]
The error she make is the last one 0.1632.3
6 0
3 years ago
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3 and 4 please helpp
Montano1993 [528]

Answer:

Figure it out dummy

Step-by-step explanation:

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Find the median of the data
nadya68 [22]
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5 0
3 years ago
Arrange the steps to perform this subtraction operation in the correct order.
taurus [48]

Answer:

=1.23*10^6

Step-by-step explanation:

We have to calculate

(1.93*10^7 )-(9.7*10^6)

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So,  

Step 1:

1.93*10^7=1.93*10*10^6

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Now,

Step 2:

=(1.93*10^7 )-(9.7*10^6 )

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Step 3:

=(10.93-9.7)*10^6

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7 0
4 years ago
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For example: you have a ruler that is 12 inches. Take a saw and cut the ruler at the "2 inch" marker. You'll end up with two smaller pieces of plastic: one of which is 2 inches, the other 10 inches. The two smaller pieces can be taped together to reform the original 12 inch ruler.

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