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Question

What is √17 - 4√15 + √8 - 2√15 equal to?

This question was previously asked in
CDS 2 2025 Maths Question Paper (14-Sep-2025)
The correct answer is

√3

By simplifying the expression, the correct result is found to be √3. Hence, the correct answer is (a) √3.

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Similar Questions

  1. If \(a^b = b^a\), then what is 

    \(\frac{a \times   (\frac{a}{b}) ^{ \frac{a}{b} } }{ (a)^{ \frac{a}{b} } }\) 

    equal to?

  2. If \(\alpha\) and \(\beta\) are the roots of the equation \(\log_{10} [998+\sqrt{x^2-18x+76}] = 3\) then what is \((\alpha - \beta)^2\) equal to?
  3. If \(x^4 + y^4 = 14x^2 y^2\), then consider the following : 

    I. \(\log_{10}(x^2 + y^2)\) = \(\log_{10} x + \log_{10} y + 2\log_{10} 2\) 

    II. \(\log_{10}(x^2-y^2)=\log_{10} x + \log_{10} y\) +\(\log_{10}2+0.5\log_{10} 3\) 

    Which of the above is/are correct?

  4. If \(\log_{10}2 = 0.301\) and \(\log_{10} 3 = 0.477\), then what is the number of digits in the expansion of \(60^{60}\) ?
  5. If \(\log_{10}(80)=p\), \(\log_{10}(45)=q\) and \(\log_{10}(216)=r\), then what is \(\log_{10}(384)\) equal to ?
  6. If log10(100001 - 4x)/(5 - x) = 1, then what is x equal to?

  7. A sum of money at the rate of \(5\%\) per annum compounded annually becomes \(n\) times in \(100\) years. What is the value of \(n\)? (Given \(\log_{10}2=0.301\), \(\log_{10}3=0.477\) and \(\log_{10}7=0.845\))

  8. What is the number of zeros immediately after the decimal point in \((0.5)^{1000}\)? (Given that \(\log_{10}2 = 0.30103\))

  9. Consider the following statements in respect of common logarithms :

    I. The logarithm of a number greater than 100 but less than 1000 lies between 2 and 3.

    II. The logarithm of a positive number less than unity is negative.

    Which of the statements given above is/are correct?


Important Questions from Logarithms

  1. Given that $132^{0.14} = x$, $132^{0.26} = y$ and $x^z = y^2$, then the value of z is close to:

  2. If \(p + q = 15\), then what is \(q-p\) equal to?
  3. If \(p + q = 66\), then which one of the following is correct?
  4. For \(x \ge y > 1\), let \(\log_x\left(\frac{x}{y}\right) + \log_y\left(\frac{y}{x}\right) = k\), then the value of \(k\) can never be equal to

  5. If \(\log_ba = p\), \(\log_dc = 2p\) and \(\log_fe = 3p\), then what is \((ace)^{\frac{1}{p}}\) equal to ?

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