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Day 121: CDS Maths

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

  1. Question 1

    Mensuration 2D. Asked once: CDS 1 2022 (same type asked 3 times) See all 3 of this type

    82
    An equilateral triangle of side xx is inscribed in a circle of radius yy. Which one of the following is correct?

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  2. Question 2

    Mensuration 3D. Asked once: CDS 2 2018 (same type asked 3 times) See all 3 of this type

    79
    A solid right cylinder is of height π\pi cm. If its lateral surface area is half its total surface area, then the radius of its base is

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  3. Question 3

    Time and Work. Asked once: CDS 2 2022 (same type asked 3 times) See all 3 of this type

    13
    X and Y can do a piece of work in 45 days and 40 days respectively. They begin to work together, but X leaves after n days and then Y completes the remaining work in 23 days. What is n equal to ?

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  4. Question 4

    Algebraic Identities and Simplification. Asked once: CDS 1 2022 (same type asked 3 times) See all 3 of this type

    9
    If x=9999x = 9999, then what is the value of the following? 4x3−x(2x+1)(6x−3)\frac{4x^3 - x}{(2x + 1)(6x - 3)}

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  5. Question 5

    Sequence and Series. Asked once: CDS 1 2020 (same type asked 3 times) See all 3 of this type

    45
    For two observations, the sum is SS and product is PP. What is the harmonic mean of these two observations?

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