Proving Binomial Theorem with Greatest Term and Coefficient Relationship

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SUMMARY

The discussion focuses on proving that if the greatest term in the binomial expansion of (1+x)2n is also the greatest coefficient, then x must lie between n/(n+1) and (n+1)/n. The participants emphasize that the greatest coefficient occurs at the nth term due to the properties of binomial coefficients. By analyzing the (n-1)th and (n+1)th terms, they demonstrate that at the specified boundaries for x, the coefficients of these terms are equal, confirming the relationship.

PREREQUISITES
  • Understanding of binomial expansion
  • Familiarity with binomial coefficients
  • Basic algebraic manipulation skills
  • Knowledge of inequalities and their applications
NEXT STEPS
  • Study the properties of binomial coefficients in detail
  • Learn about the binomial theorem and its applications
  • Explore algebraic techniques for solving inequalities
  • Investigate the implications of term relationships in polynomial expansions
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Students studying algebra, particularly those focusing on binomial expansions, mathematicians interested in combinatorial proofs, and educators teaching the binomial theorem.

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Homework Statement



Show that if the greatest term in the expansion of (1+x)2n is also the greatest coefficient, then x lies between n/n+1 and n+1/n.

Homework Equations



No idea.

The Attempt at a Solution



Don't know where to start.
 
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2n is obviously an even number, so your greatest coefficient occurs at the nth term. Use the binomial expansion to also find your (n-1)th and (n+1)th terms (their coefficients will be equal), plug in your given boundaries for x, and do a little algebra to show that at one of the boundaries the (n-1)th and nth terms are equal and at the other boundary the nth and (n+1)th terms are equal. Hopefully this leads you in the right direction.
 
Thank You, it is clear now.
 

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