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Logarithm - General Aptitude

Q1:

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

ANS:B - log (2 + 3) = log (2 x 3)

(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.