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Day 18: NDA Maths

5 questions. Try each one first, then open its answer.

  1. Question 1

    3D Geometry. This type asked 4 times: NDA 2 2017, NDA 1 2021, NDA 1 2023, NDA 2 2023. This one: NDA 2 2023

    98
    What is the angle between the lines 2x=3y=−z2x=3y=-z and 6x=−y=−4z6x=-y=-4z?

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  2. Question 2

    3D Geometry. This type asked 4 times: NDA 1 2017, NDA 2 2017, NDA 2 2021, NDA 2 2023. This one: NDA 2 2023

    100
    A point PP lies on the line joining A(1,2,3)A(1,2,3) and B(2,10,1)B(2,10,1). If zz-coordinate of PP is 7, what is the sum of the other two coordinates?

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  3. Question 3

    Binomial Distribution. This type asked 4 times: NDA 2 2019, NDA 2 2022, NDA 1 2023, NDA 2 2023. This one: NDA 2 2023

    109
    The probability that a person recovers from a disease is 0.8. What is the probability that exactly 2 persons out of 5 will recover?

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  4. Question 4

    Sequence & Series. This type asked 4 times: NDA 1 2018, NDA 2 2019, NDA 1 2021, NDA 2 2023. This one: NDA 2 2023

    11
    Let t1,t2,t3,…t_1, t_2, t_3, \ldots be in GP. What is t1t3⋯t21t_1 t_3 \cdots t_{21} equal to?

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  5. Question 5

    Statistics. This type asked 4 times: NDA 1 2019, NDA 1 2021, NDA 2 2022, NDA 2 2023. This one: NDA 2 2023

    111
    If rr is the correlation coefficient between xx and yy, then what is the correlation coefficient between (3x+4)(3x+4) and (−3y+3)(-3y+3)?

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