Logarithm

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.

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