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gizmo_the_mogwai [7]
2 years ago
13

How many different selections of 4 books can be made from a bookcase displaying 12 books?

Mathematics
2 answers:
Bingel [31]2 years ago
8 0

Answer:

495

Step-by-step explanation:

12C4 = 12*11*10*9/(4*3*2*1) = 495

Kisachek [45]2 years ago
8 0

Answer:

495

Step-by-step explanation:

12C4 = 12*11*10*9/(4*3*2*1) = 495

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In a circle with a radius of 27  2/5 in., an arc is intercepted by a central angle of 7π/4 radians. What is the arc length? Use
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\bf \textit{arc's length}\\\\
s=r\theta \quad 
\begin{cases}
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\qquad radians\\
------\\
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\\\\\\
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Step-by-step explanation:

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