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# help please... i don't know where to start

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(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!

Feb 16, 2021