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Logarithm

Q1:

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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