Home›MPPSC Forest›State Forest Service Mains Exam›Section 'B': Forestry and General Science›UNIT-10: Elementary Mathematics and General Mental Ability›Square root, percentage, ratio and proportion, use of log table›The value of \frac{\log 128 - \log 8}{\log 4} is:

The value of log⁡128−log⁡8log⁡4\frac{\log 128 - \log 8}{\log 4}log4log128−log8​ is:

20181M#mppsc-forest#pyq#mcq#2018
A.7
B.5
C.2Correct
D.None of these
Explanation & Solution

Correct Answer: (C) 2

Using logarithm properties log⁡\loglog a - log⁡\loglog b = log⁡\loglog(a/b), the numerator becomes log⁡\loglog(128/8) = log⁡\loglog 16. Since 16 = 4^2, log⁡\loglog 16 = log⁡\loglog(4^2) = 2 log⁡\loglog 4. Substituting this into the expression gives 2log⁡4log⁡4\frac{2 \log 4}{\log 4}log42log4​ = 2.

हिंदी में प्रश्न एवं आदर्श उत्तर

log⁡128−log⁡8log⁡4\frac{\log 128 - \log 8}{\log 4}log4log128−log8​ का मान है:

A.7
B.5
C.2सही
D.इनमें से कोई नहीं

सही उत्तर: (C) 2

लघुगणक के गुण log⁡\loglog a - log⁡\loglog b = log⁡\loglog(a/b) का उपयोग करने पर, अंश log⁡\loglog(128/8) = log⁡\loglog 16 बनता है। चूँकि 16 = 4^2 है, व्यंजक 2log⁡4log⁡4\frac{2 \log 4}{\log 4}log42log4​ में मान रखने पर परिणाम 2 प्राप्त होता है।

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