Suppose you choose four books to read from a summer reading list of 12 books. How many different combinations of books are possible? n! Note: Cr= (-) r!(n-r)! n

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asked May 10, 2024 191k views

1 vote

Suppose you choose four books

to read from a summer reading
list of 12 books. How many
different combinations of books
are possible?
n!
Note: Cr= (-)
r!(n-r)!
n

Suppose you choose four books to read from a summer reading list of 12 books. How-example-1

Mathematics
high-school

Guy Avraham asked

by Guy Avraham

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1 Answer

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$_(12)C_4=(12!)/(4!8!)=(9\cdot10\cdot11\cdot12)/(2\cdot3\cdot4)=495$

Matei Zoc answered May 17, 2024

by Matei Zoc

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