1) If log 2 = 0.30103, the number of digits in $2^{64}$ is : A) 20 B) 25 C) 19 D) 18 Answer: Option AExplanation:log $(2^{64})$ = $64\times$ log 2 $=64\times 0.30103$ $=19.26592$. Its characteristic is 19. Hence, the nuber of digits in $2^{64}$ is 20.
