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Calculate. о Са 9 Note: Cr = (-)! n! n

Calculate. о Са 9 Note: Cr = (-)! n! n
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3 votes
Calculate.
о Са
9
Note: Cr = (-)!
n!
n

Calculate. о Са 9 Note: Cr = (-)! n! n-example-1
User Lucidquiet
by
8.2k points

1 Answer

1 vote


_9C_4=(9!)/(4!5!)=(6\cdot7\cdot8\cdot9)/(2\cdot3\cdot4)=126

User Atomman
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