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For some positive integer $n,$ the expansion of $(1 + y)^n$ has three consecutive coefficients $a,$ $b,$ $c$ that satisfy $a:b:c = 1:7:35.$ What must $n$ be?

 

Pls explain your solution because I don't really understand this type of stuff.

 Apr 24, 2021
 #1
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See   heureka's excellent  solution, here :

 

https://web2.0calc.com/questions/help_73560#r2

 

 

cool cool cool 

 Apr 24, 2021
 #2
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yeah, but I still kind of don't understand it completely.

Guest Apr 24, 2021

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