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In the row of Pascal's triangle that starts 1, 11, what is the ninth number?

 Dec 4, 2017
 #1
avatar+578 
+3

165

 

8)

 Dec 4, 2017
 #2
avatar+98141 
+2

This will be the 11th row of the triangle  [ where the first "row"  = 1  is termed row "0" ]

 

The rth number on the nth row  is given by   C(n, r - 1)

 

So the ninth number on this row will be given by

 

C (11, 9 - 1)  = C(11,8)  =  165

 

 

cool cool cool

 Dec 4, 2017

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