WBJEE: Important Questions and Preparation Tips – Binomial Theorem

Oct 30, 2017 11:39 IST

WBJEE 2018: Binomial Theorem
WBJEE 2018: Binomial Theorem

In this article you will get chapter notes of Binomial Theorem including important concepts, formulae and previous year solved questions for WBJEE Entrance Examination 2018.

Binomial Theorem is one of the important chapters in the syllabus of WBJEE entrance examinations. About 2-3 questions are being asked from this chapter in WBJEE examination.

After the detailed analysis of the latest syllabus of Mathematics and the previous year papers of WBJEE Examination, the Subject Experts of Jaranjosh bring complete chapter notes of chapter Binomial Theorem including all important topics of chapter Binomial Theorem like binomial theorem, formula for general term in binomial expansion, formula for middle term in binomial expansion, binomial formula of some expansions etc.

About the exam:

West Bengal Joint Entrance Examination (WBJEE) is a state level common entrance test organized by West Bengal Joint Entrance Examinations Board for admission to the Undergraduate Level Engineering and Medical Courses through a common entrance test in the State of West Bengal.

Important Questions and Preparation Tips – Permutation and Combination

Important Concepts:

WBJEE Binomial Theorem

Important Questions and Preparation Tips – Sequence and Series

Some previous years solved questions are given below:

Question 1:

WBJEE Binomial Theorem Question(1)

Solution 1:

(1+x)n = C + C1x + C2x2 + ---------+Cnxn ,

(x+1)n = Cxn + C1xn–1+C2xn–2 + ------+Cn

So, coefficient of xn in [(1+x)n × (x+1)n] i.e. (1+x)2n is ( C2 +C12+ -------+Cn2), which is 2nCn

WBJEE Binomial Theorem Solution(1)

Hence, the correct option is (D).

Question 2:

WBJEE Binomial Theorem Question(2)

Solution 2:

WBJEE Binomial Theorem Solution(2)

Hence, the correct option is (b).

Important Questions and Preparation Tips - Complex Numbers

Question 3:

WBJEE Binomial Theorem Question(3)

Solution 3:

WBJEE Binomial Theorem Solution(3)

Hence, the correct option is (a).

Important Questions and Preparation Tips - Matrices and Determinants

Question 4:

WBJEE Binomial Theorem Question(4)

(a) 90

(b) 88

(c) 94

(c) 95

Solution 4:

We have the binomial expression,

WBJEE Binomial Theorem Question(4)

Except, r = 0, 15, 30, 45, 60, 75, 90 each term will give irrational terms.

So, there are 7 rational terms

Total number of terms in the given binomial expression = 101

No. of irrational terms

= 101 – 7 = 94

Hence, the correct option is (c).

Important Questions and Preparation Tips – Relations and Functions

Question 5:

WBJEE Binomial Theorem Question(5)

Solution 5:

WBJEE Binomial Theorem Solution(5)

Hence, the correct option is (A).

JEE MAIN-2017 Frequently Asked Questions (FAQs)

Preparing for Engineering Entrance Examinations 2018: Must read this article

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