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 In the expansion of \((1 + x)^n\) there exist three consecutive coefficients  \(a, b, c\)  that satisfy \(a:b:c = 1:7:35\). Find the positive integer.

 

A brief, easy to understand explanation would be greatly appreciated.

 Apr 14, 2020
 #1
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See answer here:  https://web2.0calc.com/questions/help_73560

 Apr 14, 2020
 #2
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I don't understand his solution.

 Apr 14, 2020

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