Logarithm - General Aptitude

If log₁₀ 7 = a, then log₁₀ 1 is equal to:

70

A - (1 + a)

B (1 + a)^-1

C

a

10

D

1

10a

ANS:A - - (1 + a)

log₁₀		1
		70

= log₁₀ 1 - log₁₀ 70

= - log₁₀ (7 x 10)

= - (log₁₀ 7 + log₁₀ 10)

= - (a + 1).

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