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Day 53: NDA Maths

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

  1. Question 1

    Statistics. Asked 2 times: NDA 1 2017*, NDA 1 2018 (* = numbers or wording changed that year)

    111
    In a Maths test, 20% got first class. Central angle in Pie Chart?

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  2. Question 2

    3D Geometry. Asked 2 times: NDA 1 2017*, NDA 2 2017 (* = numbers or wording changed that year)

    52
    The point of intersection of the line joining the points (−3,4,−8)(-3, 4, -8) and (5,−6,4)(5, -6, 4) with the XYXY-plane is

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  3. Question 3

    Statistics. Asked 2 times: NDA 1 2017*, NDA 2 2017 (* = numbers or wording changed that year)

    120
    The coefficient of correlation when coefficients of regression are 0.2 and 1.8 is

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  4. Question 4

    Trigonometric Identities. Asked 2 times: NDA 1 2017*, NDA 2 2017 (* = numbers or wording changed that year)

    33
    The value of 3 cosec 20°−sec⁡20°\sqrt{3}\,\text{cosec}\,20° - \sec 20° is equal to

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  5. Question 5

    3D Geometry. This type asked 2 times: NDA 1 2021, NDA 2 2026. This one: NDA 2 2026

    65
    The image of the point P(1,3,4)P(1, 3, 4) with respect to the plane Ax+By+Cz+D=0Ax + By + Cz + D = 0 is (−3,5,2)(-3, 5, 2). If A+B+C=2A + B + C = 2, then what is DD equal to?

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