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NDA - (II) 2014 Maths

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Mathematics Preparation for NDA

(49 Posts)

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This thread is dedicated to preparation for Mathematics section of NDA. You may share questions related to topics like Integral Calculus, Complex Numbers, Matrices and Determinants, Vectors, 3-D Geometry, Sequence/Series, Trigonometry, Co-Ordinate Geometry, Exponential and Logarithmic Series, Modern Algebra, Statistics, Differential Calculus, Functions and Equations, Permutation and Combination, Probability etc.

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Aman Yadav

Shared from Matrices & Determinants on Aug 26, 2020 1:12 AM

A and B are any two square matrices which one of the following is a skew symmetric matrix?

None of above

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Aman Yadav

Sir answer is A-A'/2

Sir answer is A-A'/2 Please type your answer before submitting.

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Roopkaur

Posted on Oct 03, 2020 1:34 PM

Option 3 is the correct answer.

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Supriya Singh

Shared from NDA - I (2015) Maths on Aug 17, 2020 12:28 PM

Given that the vectors and are non-collinear. The values of x and y, respectively, for which – = holds true if = 2x + y and = 2– 5, are

x = 2, y = 1

x = 1, y = 2

x = – 2, y = 1

x = – 2, y = – 1

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Supriya Singh

How can you solve this question without giving value of vector v????

How can you solve this question without giving value of vector v???? Please type your answer before submitting.

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Supriya Singh

Shared from NDA - (II) 2014 Maths on Aug 14, 2020 10:28 AM

Consider the plane passing through the points A (2, 2, 1), B (3, 4, 2) and C (7, 0, 6).

Which of the following points lies on the plane?

(1, 0, 9)

(1, 0, 1)

(0, 0, 1)

None of the above

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Supriya Singh

As when we will put value of x and z the answer will be 0 not 1

As when we will put value of x and z the answer will be 0 not 1 Please type your answer before submitting.

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Aniket Kumar

Shared from Sets, Functions and Relations - III on Jul 02, 2020 6:28 PM

Let A = {1, 2, 3, 4} and let R = {(2, 2), (3, 3), (4, 4), (1, 2)} be a relation on A. Then R is

reflexive

symmetric

transitive

None of these

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Aniket Kumar

Recheck your solution..

Recheck your solution.. Please type your answer before submitting.

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Prerna

Posted on Jul 17, 2020 2:48 PM

'transitive' is the correct answer.

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Aniket Kumar

Shared from Probability - 1 on Jun 23, 2020 11:54 AM

Let Q, R and T be three events. If the probability of occurrence of exactly one of the events out of Q and R is 1 - y, out of R and T is 1 - 2y, out of T and Q is 1 - y, and that of occurrence of three events simultaneously is y², then the probability (P) that at least one out of Q, R and T will occur is

greater than 1/2

is equal to 1/3

greater than or equal to 1/2

less than or equal to 1

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Aniket Kumar

Why in q1 we used formula of P(Q U R) as P(Q) P(R)-2P(Q intersection R) instead of p(q) p(r)-p(q intersection r) ???

Why in q1 we used formula of P(Q U R) as P(Q) P(R)-2P(Q intersection R) instead of p(q) p(r)-p(q intersection r) ??? Please type your answer before submitting.

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Roopkaur

Posted on Apr 20, 2021 5:45 PM

Option 1 is the correct answer.

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