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JEE Main 2026 Preparation: Question Papers, Solutions, Mock Tests & Strategy Unacademy » JEE Study Material » Mathematics » Binomial Theorem For Any Index

Binomial Theorem For Any Index

Learn about the positive integral index in the binomial theorem. The binomial theorem is a rule that can be used to enlarge any power of a binomial.

Table of Content
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The Binomial theorem provides a quick way to raise (or expand) a binomial statement to enormous powers. This is a crucial aspect of algebra. Permutations and combinations are discussed, as well as probability matrices, permutations, and mathematical induction. It’s an algebraic statement with two different terms connected by a + or – sign. 

Humans have known about the binomial theorem since the fourth century BC. The binomial cubes came into usage during the 6th century AD and in the 10th century AD, an Indian mathematician named Halayudha used Pascal’s triangle to describe this procedure.   

Index for Binomial Theorem

pp1

Binomial theorem for positive integral indices

According to the binomial theorem, the total number of terms in an expansion is always more than the index. Take, for example, an expansion of (a + b)n with n+1 terms and n as the index of the equation (a + b)n, where n is any positive integer. 

The binomial theorem can be used to extend (x + y)n, where n is any rational number. Let’s look at the binomial theorem for positive integral indices.

The binomial theorem is a rule that can be used to enlarge any power of a binomial.

mm2
mm3

Therefore, P(n) is true for all positive integral values of n.

Properties of binomial theorem 

  • In the binomial expansion of (x+y)n, the number of coefficients is (n+1).
  • In the expansion of (x+y)n, there are (n+1) terms.
  • xn and yn are the first term and last term respectively. 
  • The powers of x decrease from n to 0 as the expansion advances, whereas the powers of y increase from 0 to n.
  • The (r +1)th in the general term of of expansion is (x + y) n, which may be written as  Tr+1=nCr xn-ryr.
  • The coefficients of binomial expansion are organised into Pascal’s triangle. 
  • The nth term from the end of (x-y)n equals the (n-r+2)th term from the beginning in binomial expansion.   
  • The middle term in (x + y)n is (n/2)+1 if n is even; however, if n is odd, the middle terms are (n+1)/2 and (n+3)/2.

Coefficient of binomial theorem

The binomial coefficients are the figures associated with the variables x, y, in the expansion of (x +y)n. The binomial portions are represented as nC0, nC1, nC2. The binomial coefficients are attained through the Pascal triangle or by using the combinations formula.

Conclusion 

The binomial expansion has more application than algebra II. In statistics, it is used to calculate the binomial distribution. 

This allows statisticians to quantify the risk of a certain number of positive results in a set of trials. 

Binomial expansion is also intriguing from a fine perspective as it allows mathematicians to gain insight into the properties of polynomials. 

Binomial developments are used in numerous numerical and logical calculations, including kinematic and gravitational time enlargement, active energy, electric quadrupole post and determining the relativity factor gamma, to mention a few. 

The number of terms in a binomial expansion of a binomial articulation raised to some power is another factor of the binomial development.

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What is the binomial theorem in statistics?

Ans. The binomial theorem, sometimes known as the binomial expansion, is the most frequent approach for calculating ...Read full

In forecasting weather conditions, which binomial theorem is implied?

Ans. The binomial theorem is a technique for extending a binomial statement raised by any number of finite powers. T...Read full

State n and r in a binomial theorem.

Ans. The binomial theorem asserts that the nth power of the sum of any two nu...Read full

Why do we need an expansion of binomials?

Ans. Expanding the power of binomials or sums of two words results in the theory of binomials (or binomial expansion...Read full

Where can we utilise binomials in the real world?

Ans. In real life, there are numerous examples of binomial distributions. When a new drug is developed to treat a si...Read full

Ans. The binomial theorem, sometimes known as the binomial expansion, is the most frequent approach for calculating statistics using a simple formula. For binomial experiments with two outcomes, such as heads or tails, this method (formula) is used to compute the probability.

Ans. The binomial theorem is a technique for extending a binomial statement raised by any number of finite powers. The binomial theorem is used to forecast weather, as well as anticipate the country’s economic growth in the coming years and the distribution of IP addresses.

Ans. The binomial theorem asserts that the nth power of the sum of any two numbers a and b may be expressed as the sum of n + 1 in terms of the particular form for any given positive integer n. 

n – r + 1 is the theorem, where n is known to be equal to the exponent of any given binomial and r indicates the term number.

Ans. Expanding the power of binomials or sums of two words results in the theory of binomials (or binomial expansion). The theorem and its generalisations can be used to show results and solve problems in algebra, combinatorics, calculus, and other fields of mathematics.

Ans. In real life, there are numerous examples of binomial distributions. When a new drug is developed to treat a sickness or condition, for example, it either cures the ailment (is effective) or does not treat the illness (is unsuccessful). If you buy a lottery ticket, either you’ll win money or you won’t. These are some examples of binomial distributions.

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