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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 many different combinations of books are possible? n! Note: Cr= (-) r!(n-r)! n
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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
asked
User Guy Avraham
by
8.8k points

1 Answer

2 votes


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

answered
User Matei Zoc
by
7.8k points
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