Proving Binomial Theorem with Greatest Term and Coefficient Relationship

In summary, to show that x lies between n/n+1 and n+1/n, use the binomial expansion to find the (n-1)th, nth, and (n+1)th terms, with the greatest coefficient occurring at the nth term. Plug in the given boundaries for x and use algebra to show that at one boundary the (n-1)th and nth terms are equal, and at the other boundary the nth and (n+1)th terms are equal. This will demonstrate that x falls within the given range.
  • #1
Quantum Mind
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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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  • #2
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.
 
  • #3
Thank You, it is clear now.
 

Related to Proving Binomial Theorem with Greatest Term and Coefficient Relationship

1. What is the binomial theorem?

The binomial theorem is a mathematical formula that describes the expansion of a binomial expression raised to a positive integer power. It is often used to simplify calculations involving binomial expressions.

2. How do you prove the binomial theorem?

The binomial theorem can be proved using mathematical induction or by using a combinatorial argument. Both methods involve breaking down the binomial expression into smaller parts and using algebraic manipulations to arrive at the desired result.

3. Why is the binomial theorem important?

The binomial theorem is important because it is a fundamental concept in algebra and has numerous applications in various fields of mathematics, including probability, statistics, and calculus. It also allows for efficient and accurate calculations involving binomial expressions.

4. What are the limitations of the binomial theorem?

The binomial theorem is only applicable to binomial expressions raised to positive integer powers. It cannot be used for expressions with negative or fractional powers. Additionally, it does not hold true for all types of numbers, such as complex numbers.

5. Can the binomial theorem be extended to more than two terms?

Yes, the binomial theorem can be extended to any number of terms using the multinomial theorem. This theorem allows for the expansion of a polynomial expression with any number of terms raised to a positive integer power.

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