Ratio, Proportion, Indices, LogarithmMCQMTP Sep 24 Series IQuestion 981 of 305
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Given that log102=x\displaystyle \log_{10} 2 = x and log103=y\displaystyle \log_{10} 3 = y, the value of log10120\displaystyle \log_{10} 120 is expressed as

Options

A2xy+1\displaystyle 2x - y + 1
B2x+y+1\displaystyle 2x + y + 1
C2xy1\displaystyle 2x - y - 1
DNone of these
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Correct Answer

Option b2x+y+1\displaystyle 2x + y + 1

All Options:

  • A2xy+1\displaystyle 2x - y + 1
  • B2x+y+1\displaystyle 2x + y + 1
  • C2xy1\displaystyle 2x - y - 1
  • DNone of these

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Detailed Solution & Explanation

120=22×3×10=4×30120 = 2^2 \times 3 \times 10 = 4 \times 30

log10120=log10(22×3×10)\log_{10} 120 = \log_{10}(2^2 \times 3 \times 10)

=2log102+log103+log1010= 2\log_{10} 2 + \log_{10} 3 + \log_{10} 10

=2x+y+1= 2x + y + 1

**The answer is (b) 2x+y+1\displaystyle 2x + y + 1.**

About This Chapter: Ratio, Proportion, Indices, Logarithm

Paper

Paper 3: Quantitative Aptitude

Weightage

5-7 Marks

Key Topics

Ratio, Proportion, Indices, Logarithms

This chapter covers Ratio, Proportion, Indices, Logarithms and is part of Paper 3: Quantitative Aptitude in the CA Foundation exam.

View Official ICAI Syllabus

Exam Strategy Tip

This topic carries 5-7 Marks weightage. Focus on understanding core concepts rather than memorizing.

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