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Aptitude - Logarithm - Discussion

@ : Home > Aptitude > Logarithm > General Questions - Discussion

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"The secret to creativity is knowing how to hide your sources."
- Albert Einstein
1. 

Which of the following statements is not correct?
[A]. log10 10 = 1
[B]. log (2 + 3) = log (2 x 3)
[C]. log10 1 = 0
[D]. log (1 + 2 + 3) = log 1 + log 2 + log 3

Answer: Option C

Explanation:

(a) Since loga a = 1, so log10 10 = 1.

(b) log (2 + 3) = log 5 and log (2 x 3) = log 6 = log 2 + log 3

      log (2 + 3) log (2 x 3)

(c) Since loga 1 = 0, so log10 1 = 0.

(d) log (1 + 2 + 3) = log 6 = log (1 x 2 x 3) = log 1 + log 2 + log 3.

So, (b) is incorrect.
K.Manohar Reddy said: (Sun, May 22, 2011 03:33:03 AM)    
 
Its absolutely correct.
Begum said: (Sun, Aug 21, 2011 04:26:32 PM)    
 
Its great.
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