(a) Simplify \(\frac{\binom{n}{k}}{\binom{n}{k - 1}}\)

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

Any help is appeciated, thanks!

Guest Feb 16, 2021

#1**0 **

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Guest Feb 16, 2021