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Binomial Theorem belongs to the 8 chapter of NCERT. The NCERT Class 11 Maths chapter 8 notes entirely cover up the main portions of the chapter Binomial Theorem. In the introduction Binomial Theorem Class 11 notes we will learn about how we can find an expanded form of an expression with an index. Binomial Theorem Class 11 notes describe how we get pascal’s triangle from the expansion of where n=1, 2, 3. Class 11 Math chapter 8 notes cover the main topics that are a number of terms of an expansion, how to use combination formula to the expanded form, the middle term of
when n is an even or odd.
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A Class 11 Math chapter 6 notes help you to find the entire chapter in an easy way. NCERT Notes for Class 11 Maths chapter 6 not only covers the NCERT notes but covers CBSE Class 11 Maths chapter 8 notes also.
After going through Class 11 Binomial Theorem notes
Students can also refer to,
We know,
If we observe each expansion,
The total number of terms of each expansion is 1 more than the index of.
In the expansion, the power of the first quantity is gradually decreasing that is by 1 and the power of the second quantity is gradually increased that is by 1.
Suppose n is the index of , then the sum of indices of a and b of each term of the expansion is n.
Now arranging of the coefficients of expansion with respect to their index
Index Coefficients
If we observe the pattern we can get the coefficient of the next index.
The pattern is given below
Figure: 1
This diagram is known as Pascal’s triangle.
If we apply Pascal’s triangle rule, then the coefficients of will be
1 5 10 10 5 1
Similarly, the coefficient of will be
1 6 15 20 15 6 1
Now we can apply the combination formula to find the coefficients.
Binomial coefficient (for a Positive integral index n ) where n and r are a positive integer and
.
Figure 2 can be rewritten as
Index Coefficients
Binomial Theorem:
Binomial theorem for any positive integer n
Proof:
We will proof the theorem by using principal induction.
Let
Putting
For it is true.
Assume that it is true for
We will prove that i.e
is true by using
.
Now,
Add like terms
Now apply the formula,
, and
Hence proved.
Properties of Binomial coefficient
1.
2.
and
hence prove both are equal.
3. If only if
and
4.
5. If n is a positive integer and x, y are two complex numbers, then
Here are binomial coefficients.
6. Total no. of terms of the given as (n + 1) in the expansion
To find the middle terms of using the binomial theorem
The general equation of the binomial is given as
There are two case
If n is odd
The number of terms of when
is an odd number is
. Here
is an even number. So there will be two middle terms. That are
and
of the expansion.
If n is even
The number of terms of when
is an eve number is
. Here
is an odd number. So there will be one middle term. That is
of the expansion.
To find the sum of the coefficient of the binomial terms we have to put the value of x numerical is one.
For example
Q if the binomial express is then find the sum of the binomial coefficient is?
Solution:- Write the given expression now we have to put the value of
and get The coefficient sum =
=
= 1
So Sum of the binomial coefficient is 1.
Some Properties of the Binomial coefficients
Put
Put
Some Particular expansions
Significance of NCERT Class 11 Math Chapter 8 Notes
Class 11 Binomial Theorem notes will be really helpful to revise the chapter and get a brief overview of the important topics. Also, notes for Class 11 Maths chapter 8 is useful for covering Class 11 CBSE Maths Syllabus and also for competitive exams like BITSAT, and JEE MAINS. Class 11 Maths chapter 8 notes pdf download can be used for preparing in offline mode.
Binomial Theorem Class 11 notes pdf download: link
NCERT Class 11 Maths Chapter 8 Notes |
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