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Logarithm - General Aptitude

Q1:

If log 2 = 0.30103, the number of digits in 264 is:

A 18

B 19

C 20

D 21

ANS:C - 20

log (264) = 64 x log 2
  = (64 x 0.30103)
  = 19.26592
Its characteristic is 19. Hence, then number of digits in 264 is 20.