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Q.

What is the value of log39 +log525 + log28   ?


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a

4

b

5

c

6

d

7 

answer is D.

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Detailed Solution

Given that the expression:
= log39 +log525 + log28   
We can write this three terms in following way.
log39 =log332 , log525 =log552 ,  log28 = log223   
= log332  + log552 +  log223 = 2 log33 + 2 log55 + 3 log22
= 2 + 2+ 3
= 7.
Hence, the correct option is 4.
 
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