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Logarithm to base 10 (that is b = 10) is called the

  • A.binary logarithm
  • B.natural logarithm
  • C.common logarithm
  • D.inverse logarithm

Answer: C

The logarithm to base 10 is the common logarithm, written \( \log_{10} \) or simply \( \log \).

\[ \log 1000 = 3 \quad\text{since}\quad 10^{3} = 1000 \]

It is the one tabulated in log tables, because our number system is decimal and the characteristic then records the power of ten directly.

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